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Russia has accused Washington of pressuring nations to carry out a mass expulsion of its diplomats in response to a nerve agent attack in the UK. Foreign Minister Sergei Lavrov accused the US of "colossal blackmail" and said there were "few independent countries" left in modern Europe. The expulsion of 140 Russians by 25 nations is thought to be the largest in history. In this podcast we hear from a Russian expert and the Estonian President.

(Image: Russian embassy in UK sign, credit: EPA)