The U.S. on Thursday joined the U.K., France and Germany to condemn the poisoning of a Russian double agent in Britain as “an assault on U.K. sovereignty,” saying it constituted a breach of international law and calling on Russia to explain its role in the attack.
The show of unity by the four countries deepens the isolation of Moscow, which has responded defiantly to the U.K.’s accusations that it was culpable in the attempted murder of Sergei Skripal and his daughter with Novichok, a nerve agent developed in the Soviet Union.
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