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Russia has tested new nuclear weapons that cannot be tracked by Western defence systems, says Putin Russia has 'unstoppable' supersonic nuclear missile that cannot be traced by Western defence systems, says Putin
(35 minutes later)
Russia has tested an array of new nuclear weapons including a supersonic missile that cannot be tracked by enemy defence systems, Vladimir Putin has announced. Russia has tested an array of nuclear weapon systems including a new supersonic missile untraceable by enemy anti-missile systems, Russian President Vladimir Putin has announced. 
The country's president said it is trialling new underwater drones that can carry nuclear bombs, as well as developing atomic warheads small enough to be delivered on a cruise missile. In a belligerent state of the nation speech delivered to lawmakers on Thursday, Mr Putin said the new weapons would be unique to Russia. 
He added during a state-of-the-nation speech that the supersonic missile, tested last autumn, has an unlimited range and is capable of penetrating any missile defence. He announced a new intercontinental ballistic missile complex (ICBM) codenamed Sarmat. Weighing more than 200 tonnes, the system has an increased range over its predecessor. “No anti-missile system will get in its way,” claimed the president.  The president made several other major announcements. First, new underwater drones capable of carrying nuclear bombs (an animation showed the submarine striking an aircraft carrier and seaside town.) Second, the development of a new nuclear cruise missile with unpredictable flight trajectory and unlimited range.
He described the high-speed underwater drone as being capable of carrying a nuclear warhead able to target both aircraft carriers and coastal facilities. Capable of penetrating any anti-missile or air defence systems, this weapon has the potential to change the current international strategic balance. 
Mr Putin said Russia has also tested a new heavy intercontinental ballistic missile (ICBM), called Sarmat, with a range and a number of warheads exceeding the capabilities of its predecessor. There were “significant results” in the field of laser weapons, too, but Mr Putin declined to elaborate.  
More follows… Throughout the course of his speech, the Russian president made it clear that the focus of new weapon systems was the United States. He claimed Russia had been moved to step up development in response to the United States’ withdrawal from the treaty on anti-ballistic weapons systems in 2002: “They thought we would never be able to recover economically, militarily, and so they didn’t take our opinion into account.” 
  Any use of nuclear weapons against Russia or its allies would be considered an attack on Russia, he said. "Small-scale, large-scale, it doesn't matter — the response will be immediate"