It has been called the worst crisis to hit Europe in the 21st century'. The overthrow of the government in Ukraine and the subsequent incursion by Russian forces in Crimea has left European politicians fumbling for an adequate response.
So far, no more than warning shots have been fired as the deadlock continues. Meanwhile, Crimean citizens will be allowed to give their view on their future in a referendum on 16 March asking whether they want to join the Russian Federation.
Joining Tom Clark in the studio to discuss all of this: Guardian columnists Seumas Milne and Jonathan Freedland; and Marie Mendras, a scholar on Russian affairs and author of Russian Politics:The Paradox of a Weak State
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