President Vladimir Putin has put Russia's nuclear forces on high alert after 'unacceptable remarks' made by NATO diplomats including the UK's foreign secretary Lizz Truss.
Truss said on Sunday that the situation could lead to conflict with NATO if Russia's current course was not stopped.
Chris Jones has more in London.
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http://www.fsnradionews.com/feeds/0228-Kremlinnuclearthreat-CJ-generic.mp3