Matthew Bunn

President Barack Obama and Russia's foreign minister, Sergey Lavrov, are seen in this combination photo as they attend the opening ceremony of the Nuclear Security Summit in The Hague on March 24, 2014.

Relations with Russia chill, and nuclear security cooperation gets put on ice

The US and Russia have cooperated for two decades to secure Russia's nuclear stockpile, a program that was a rare bright spot in the relationship between the two powers. But while the dangers haven't decreased, Russia may be ready to end American aid because of the situation in Ukraine.

Relations with Russia chill, and nuclear security cooperation gets put on ice
U.S. President Barack Obama looks up as he and Netherlands' Prime Minister Mark Rutte hold a joint news conference at Gemeentemuseum Den Haag at the conclusion of the Nuclear Security Summit in The Hague March 25, 2014. World leaders called on Tuesday for

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