The White House now says President Obama will not meet with Russian President Vlaidmir Putin in Moscow.
"This is certainly a significant turn," CNN's Phil Black reports. "The key trigger for calling off this meeting is that name we've come to know so well, Edward Snowden, and Russia's decision to grant him temporary political asylum."
But it is by no means the only issue at stake. This is really the culmination in a long, steady decline in the relations between these two countries. This is partly because of some big disagreements and a lack of progress on big international issues like Syria, missile defense, nuclear disarmament and also domestic Russian politics in the United States.