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Ukraine maps: Ukraine says Russian ceasefire offer "immoral" Ukraine maps: Ceasefire allows people to leave cities
(about 20 hours later)
Russian troops have made significant advances, with Ukrainian forces and civilians under heavy bombardment. Russian troops advancing towards Kyiv in the north of Ukraine have been slowed down by attacks from Ukrainian forces and hampered by serious logistical problems.
Here are the latest developments on day 12 of the invasion: Analysts say they have been more successful in the south of the country, rapidly gaining ground and advancing towards the key city of Odesa.
Hundreds of thousands of people are trapped in cities under heavy bombardment. Here are the latest developments on day 13 of the invasion:
Russia's latest ceasefire proposal for cities including Kyiv has been branded "immoral" by Ukraine A ceasefire has been agreed to allow civilians to leave the city of Sumy and the town of Irpin, near Kyiv.
Russia said civilians could leave, but mainly on routes to Belarus or Russia itself. Civilians are reported to have been killed in several cities after another night of shelling.
Ukraine says Russian forces are preparing for an assault on Kyiv. Russian forces are believed to be preparing for an assault on Kyiv.
More than two million people have now fled the fighting in Ukraine.
Russia launched its attack in the early hours of 24 February from three main directions: north, south and east.Russia launched its attack in the early hours of 24 February from three main directions: north, south and east.
Some 95% of the troops positioned around Ukraine in the build-up to the invasion are now on Ukrainian territory, according to US officials. Nearly all the the troops positioned around Ukraine in the build-up to the invasion are now on Ukrainian territory, according to US officials.
Targets all over the country have been attacked from land, sea and air. Targets all over the country have been attacked from land, sea and air. But the Ukrainian military says the Russian advance has slowed and the occupiers are demoralised.
On Monday, Russia proposed a number of humanitarian corridors from key cities. On Tuesday, Ukraine and Russia agreed a humanitarian corridor to evacuate civilians from the city of Sumy, which has been under bombardment by Russian forces for days.
But four of the six proposed routes to safety went to Russia in the east, or to Belarus, its key ally, to the north. A column of evacuees, including international students, has left the city for Poltava in central Ukraine. 
Ukraine condemned this condition as "completely immoral". Civilians are also being evacuated from the town of Irpin near the capital, Kyiv where there has been heavy fighting in recent days.
There are reports another route towards the southern city of Mariupol has come under fire. Buses and lorries are on their way to deliver humanitarian aid to the city and to evacuate civilians to Zaporizhzhia. 
Ukraine claimed previous routes had been impossible to use, with both sides accusing each other of breaking the ceasefire.
The fight for KyivThe fight for Kyiv
There has been intense shelling in recent days in areas to the north-west of Kyiv. There has been intense shelling around Kyiv in recent days, and analysts say Russian troops are bringing up reinforcements and supplies for an assault on the capital.
Irpin has seen some 2,000 civilians flee, with some killed as a heavy Russian bombardment continued. In Irpin, to the north-west of the city, Russian forces are using "siege and starve" tactics, according to the Institute for the Study of War.
Targets around the centre of the city have been struck from the air, but ground forces have not advanced beyond the suburbs. With their advance to the city centre held back by Ukrainian forces, Russian forces have shelled civilian areas, cutting off electricity, food and water supplies. At least 2,000 civilians have fled.
The UK Ministry of Defence (MoD) says the front of a long convoy of Russian military vehicles remains in this area and has made little progress in recent days. Chechen troops who are believed to be specialists in close combat and urban warfare, have been deployed to Myla, to Irpin's south-west.
Russian troops are also advancing from the Sumy area in the east, and are active in the Brovary area.
The UK Ministry of Defence (MoD) says Ukrainian forces around the nearby towns of Hostomel, Bucha, Vorzel and Irpin continue to resist the Russian offensive towards Kyiv.
Video shows extent of Russian military convoy near KyivVideo shows extent of Russian military convoy near Kyiv
War in Ukraine: More coverageWar in Ukraine: More coverage
LIVE: Latest updates from on the groundLIVE: Latest updates from on the ground
IN KYIV: Locals fear another Grozny or AleppoIN KYIV: Locals fear another Grozny or Aleppo
ANALYSIS: Europe finally steps upANALYSIS: Europe finally steps up
EXPLAINED: Why Putin has invaded Ukraine?EXPLAINED: Why Putin has invaded Ukraine?
IN DEPTH: Full coverage of the conflictIN DEPTH: Full coverage of the conflict
Strike from the northStrike from the north
Russian troops initially made quick gains, advancing from Belarus down the west side of the Dnieper river via Chernobyl.Russian troops initially made quick gains, advancing from Belarus down the west side of the Dnieper river via Chernobyl.
However, the MoD says the main body of the large Russian column advancing on Kyiv remains over 30km (19 miles) from the centre of the city.However, the MoD says the main body of the large Russian column advancing on Kyiv remains over 30km (19 miles) from the centre of the city.
To the north-east of Kyiv, Chernihiv is still under intense bombardment, according to Ukraine's military, with several residential areas reduced to rubble. Many vehicles are believed to have run out of fuel or broken down.
Russian forces have also been advancing on the Ukrainian capital from further east. There has also been intense fighting around Hostomel airport, which has changed hands several times.
A large Russian force had gathered around Troebortno in the days leading up to the invasion. Russian troops have also faced strong Ukrainian opposition to the north-east of Kyiv.
There has also been intense fighting around Hostomel airport, which has changed hands times several times. Chernihiv has come under intense bombardment, according to Ukraine's military, with several residential areas reduced to rubble.
Russia's advance on Kyiv from the east has also faced Ukrainian opposition.
Strike from the southStrike from the south
In the south, there is growing concern for tens of thousands of civilians trapped in the port city of Mariupol. Russian forces have made rapid gains across the south of the country, advancing east and west from Crimea.
Two attempts to evacuate them over the weekend ended in failure with Russia and Ukraine accusing each other of violating a humanitarian ceasefire. In the east, there is growing concern for tens of thousands of civilians trapped in the port city of Mariupol.
Reports say there is no electricity or running water in the city and that there are bodies in the streets. The UN says civilians Mariupol, Kharkiv, Melitopol and elsewhere "desperately need aid, especially life-saving medical supplies".
In Mykolaiv rocket strikes are reported to have caused fires in residential areas. People are trapped without food, running water or electricity or running water and there are reports of bodies in the streets.
Russian control of Mykolaiv would clear the way for an advance on the port of Odesa. To the west, Russian forces are moving in the direction of Odesa, where Ukrainian forces are preparing for an attack in the coming days.
The US says an assault on Odesa is not imminent, but Ukrainian forces in the city are preparing for an attack in the coming days.
Analysts say a Ukrainian defeat in Odesa would be hugely significant.
It would seal off Ukraine from its coastline and secure a path for Russian forces from Donetsk to the Moldovan border.It would seal off Ukraine from its coastline and secure a path for Russian forces from Donetsk to the Moldovan border.
In Mykolaiv, rocket strikes are reported to have caused fires in residential areas.
Analysts say Russian troops may be trying to bypass the city in order to attack Odesa.
Ukrainian authorities say Russian forces have crossed the river at Kashpero-Mykolaivka, and have been seen advancing towards Vosnesensk.
Strike from the eastStrike from the east
Kharkiv, the second-largest city in Ukraine, has faced intense aerial bombardment in recent days.Kharkiv, the second-largest city in Ukraine, has faced intense aerial bombardment in recent days.
Ukraine's ministry of defence intelligence service says a top commander in the Russian army has been killed during fighting near the city. The BBC cannot independently verify the claim.
Large residential areas in the city have been hit by artillery rounds, which UN prosecutors are now investigating as a possible war crime.Large residential areas in the city have been hit by artillery rounds, which UN prosecutors are now investigating as a possible war crime.
There were also civilian casualties in Sumy after an aerial bombardment destroyed residential buildings. Ukrainian troops have been fighting back against Russian forces targeting the city, targeting their supply lines on the roads from Russian border.
But a Ukrainian counter-offensive near Kharkiv damaged Russian front-line units, according to the ISW, and there are claims Ukrainian forces pushed the Russians back to the border north west of Kharkiv.But a Ukrainian counter-offensive near Kharkiv damaged Russian front-line units, according to the ISW, and there are claims Ukrainian forces pushed the Russians back to the border north west of Kharkiv.
There are also thought to be about 15,000 Russian-backed separatists in Donetsk and Luhansk, who may help a Russian advance. Ukraine believes the figure is higher.There are also thought to be about 15,000 Russian-backed separatists in Donetsk and Luhansk, who may help a Russian advance. Ukraine believes the figure is higher.
Thousands flee across bordersThousands flee across borders
Since the invasion began, more than 1.7 million people have fled Ukraine, according to the United Nations. It's the fastest-growing refugee crisis in Europe since World War II. Since the invasion began, more than two million people have fled Ukraine, according to the United Nations. It's the fastest-growing refugee crisis in Europe since World War II.
Unicef, the UN children's agency, believes around half of them are children and young people.Unicef, the UN children's agency, believes around half of them are children and young people.
Refugees are crossing the borders to neighbouring countries to the west, such as Poland, Romania, Slovakia, Hungary and Moldova.Refugees are crossing the borders to neighbouring countries to the west, such as Poland, Romania, Slovakia, Hungary and Moldova.
How many refugees are there?How many refugees are there?
By David Brown, Bella Hurrell, Dominic Bailey, Mike Hills, Lucy Rodgers, Paul Sargeant, Mark Bryson, Zoe Bartholomew, Sean Willmott, Sana Dionysiou, Joy Roxas and Gerry Fletcher. By David Brown, Bella Hurrell, Dominic Bailey, Mike Hills, Lucy Rodgers, Paul Sargeant, Mark Bryson, Zoe Bartholomew, Sean Willmott, Sana Dionysiou, Joy Roxas, Gerry Fletcher and Jana Tauschinski.
About these mapsAbout these maps
To indicate which parts of Ukraine are under control by Russian troops we are using daily assessments published by the Institute for the Study of War with the American Enterprise Institute's Critical Threats Project.To indicate which parts of Ukraine are under control by Russian troops we are using daily assessments published by the Institute for the Study of War with the American Enterprise Institute's Critical Threats Project.
From 2 March this daily assessment differentiated between "Assessed Russian-controlled Ukrainian territory" and "Assessed Russian advances in Ukraine", the latter indicating areas where Russians are believed to have launched attacks from but which they do not control.From 2 March this daily assessment differentiated between "Assessed Russian-controlled Ukrainian territory" and "Assessed Russian advances in Ukraine", the latter indicating areas where Russians are believed to have launched attacks from but which they do not control.
To show key areas where advances are taking place we are also using daily updates from the UK Ministry of Defence and BBC research. To show locations where there have been attacks or explosions we are using reports that have been verified by the BBC.To show key areas where advances are taking place we are also using daily updates from the UK Ministry of Defence and BBC research. To show locations where there have been attacks or explosions we are using reports that have been verified by the BBC.
The situation in Ukraine is fast moving and it is likely there will be times when there have been changes not reflected in the maps.The situation in Ukraine is fast moving and it is likely there will be times when there have been changes not reflected in the maps.