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Ukraine maps: At-a-glance guide to the Russia war Ukraine maps: At-a-glance guide to the Russia war
(about 16 hours later)
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. Russian troops are advancing towards Kyiv in the north of Ukraine - but have been slowed down by attacks from Ukrainian forces and logistical problems.
Analysts say they have been more successful in the south of the country, rapidly gaining ground and advancing towards the key city of Odesa. Here are the latest developments on day 15 of the invasion:
Here are the latest developments on day 14 of the invasion: Ukraine's president says Russia's bombing of a hospital in Mariupol is a war crime
Ceasefires agreed in Sumy, Mariupol and elsewhere for evacuations The US warns Russia could be planning a chemical or biological attack
Humanitarian corridors also set up for several areas around Kyiv Moscow has deployed conscript troops
More than two million people have now fled the fighting in Ukraine Russian forces continue to encircle Kharkiv in the east and Mariupol in the south
The Russians also appear to be encircling the southern city of Mykolayiv from the east
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.
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 UK Ministry of Defence (MoD) says Ukranian forces have had "considerable success" against Russia's air force and probably prevented them from controlling the airspace. 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 UK Ministry of Defence (MoD) says Ukrainian forces have had "considerable success" against Russia's air force and probably prevented them from controlling the airspace.
On Tuesday, 7,000 civilians were evacuated from the city of Sumy, which has been under bombardment by Russian forces for days.
Previous attempts at evacuating people from besieged cities had failed, with both sides accusing each other of breaking ceasefires.
Further humanitarian corridors have been agreed for use by civilians on Wednesday in areas where fighting has intensified in recent days.
The fight for KyivThe fight for 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 within the next few days. There has been intense shelling around Kyiv in recent days, but the Institute for the Study of War (ISW) says that although Russian operations to attack the capital have likely begun, they have been on a smaller scale and more ad hoc than expected.
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 (ISW). The small scale of the advances make a large-scale attack on Kyiv less likely, they add.
Russian forces have shelled civilian areas, cutting off electricity, food and water supplies. At least 2,000 civilians have fled. Retired British General, Sir Richard Barrons, says Russia isn't making the progress it hoped for - but is still in a strong position.
Russian troops are also advancing from the Sumy area in the east, and are active in the Brovary area, while Ukrainian forces are attempting to disrupt Russian supply lines there, in order to stall further advances. The Russians are struggling to mobilise reserve forces, after suffering substantial losses.
In Irpin, to the north-west of the city, Russian forces are using "siege and starve" tactics, the ISW says, with Russian forces shelling civilian areas, cutting off electricity, food and water supplies. Thousands of civilians have fled.
War in Ukraine: More coverageWar in Ukraine: More coverage
LIVE: Latest updates from on the groundLIVE: Latest updates from on the ground
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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
Slow Russian progress in the northSlow Russian progress in 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.
Many vehicles are believed to have run out of fuel or broken down.Many vehicles are believed to have run out of fuel or broken down.
There has also been intense fighting around Hostomel airport, which has changed hands several times.There has also been intense fighting around Hostomel airport, which has changed hands several times.
Russian troops have also faced strong Ukrainian opposition to the north-east of Kyiv. Russian forces have continued efforts to take Chernihiv to the north east and are trying to maintain control of their lines of communication to Sumy in the east, the ISW says.
Chernihiv has come under intense bombardment, according to Ukraine's military, with several residential areas reduced to rubble. But they are facing strong Ukrainian opposition. Ukrainian troops have been targeting their supply lines on the roads from the Russian border.
Russia's advance on Kyiv from the east has also faced Ukrainian opposition.
Big Russian gains in the southBig Russian gains in the south
Russian forces have made rapid gains across the south of the country, advancing east and west from Crimea.Russian forces have made rapid gains across the south of the country, advancing east and west from Crimea.
In the east, there is growing concern for tens of thousands of civilians trapped in the port city of Mariupol, which is encircled by Russian forces.In the east, there is growing concern for tens of thousands of civilians trapped in the port city of Mariupol, which is encircled by Russian forces.
A Russian air strike on a maternity and children's hospital there is a war crime, Ukrainian President Volodymyr Zelensky says.
The UN says civilians in Mariupol, Kharkiv, Melitopol and elsewhere "desperately need aid, especially life-saving medical supplies".The UN says civilians in Mariupol, Kharkiv, Melitopol and elsewhere "desperately need aid, especially life-saving medical supplies".
People are trapped without food, running water or electricity and there are reports of bodies in the streets.People are trapped without food, running water or electricity and there are reports of bodies in the streets.
To the west, Russian forces are moving in the direction of Odesa, where Ukrainian forces are preparing for an attack in the coming days. To the west, Russian forces around Kherson appear to be moving toward Mykolayiv and west toward Odesa, although they could attempt to drive north east towards Zaporizhya, the ISW says.
It would seal off Ukraine from its coastline and secure a path for Russian forces from Donetsk to the Moldovan border. Taking Odesa 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.
Limited Russian advance in the eastLimited Russian advance in the east
Kharkiv, the second-largest city in Ukraine, has faced intense aerial bombardment. Kharkiv, the second-largest city in Ukraine, continues to face intense aerial bombardment but Russia has not renewed attempts to take the city through a large-scale ground assault, the ISW says.
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.
Artillery attacks on residential areas of Kharkiv are being investigated by UN prosecutors for possible war crimes.Artillery attacks on residential areas of Kharkiv are being investigated by UN prosecutors for possible war crimes.
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 the city. Russian forces in the area have continued operations to the south east of the city, analysts say, with efforts launched to seize Izyum.
Ukrainian troops have also been fighting back against Russian forces near Sumy, targeting their supply lines on the roads from the Russian border. There are thought to be about 15,000 Russian-backed separatists in Donetsk and Luhansk in the south east, who may help a Russian advance.
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. Ukraine believes the figure is higher.
Thousands flee across bordersThousands flee across borders
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 Two.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 Two.
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.
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, Gerry Fletcher and Jana Tauschinski.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.