article_snippet: Washington now seeks to persuade Russia to come back into full compliance and has threatened a variety of costs, including possible military countermeasures -- on top of the opprobrium of Russia's European and Asian neighbors, who would be targeted by such a missile.
article_snippet: The costs of noncompliance for Moscow could be significant.
article_snippet: At the same time, concern has grown that the port city of Mariupol could be the next separatist/Russian target.
article_snippet: An assault on Mariupol (or elsewhere in eastern Ukraine) would probably trigger severe costs in the form of a new round of Western economic sanctions on Russia and the provision to Ukraine of greater military assistance, including defensive arms.
article_snippet: As Hans Binnendijk and John Herbst recently suggested in The New York Times, the United States and European Union should tell the Russians now what costs would be imposed if there is an assault on Mariupol, in order to help deter such an attack.