http://online.wsj.com/article/SB116468651000734270.html?mod=opinion_main_featured_stories_hs
BY BRET STEPHENS
It's time we start thinking of Vladimir Putin's Russia as an enemy of the United States.
This isn't simply because a former KGB agent turned Putin critic died last week in London after ingesting a dose of polonium 210, an element that usually functions as a neutron trigger in atomic bombs. Nor is it that Alexander Litvinenko's death is the latest in a series of killings, attempted murders, imprisonments and forced exiles whose victims just happened to be prominent opponents of Mr. Putin. It is because the foreign policy of Russia has become openly, and often gratuitously, hostile to the ...