Russia has deployed equipment during the conflict in eastern Ukraine that can be used for nuclear weapons, NATO’s top military commander said.
While there’s no “direct evidence” that the Kremlin has made deployments of nuclear arms, U.S. Air Force General Philip Breedlove said on Thursday, “that does not mean that they may not have happened.”
“Lots of the systems that the Russians use to deliver nuclear weapons are dual-use systems -- they can be either conventional or nuclear -- and some of those systems are deployed,” Breedlove said.
Violence has continued in Ukraine’s easternmost regions despite a cease-fire agreed to in February, with NATO accusing Russian President Vladimir Putin of deliberately destabilizing the area following Russia’s annexation of Crimea last year.

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 http://www.bloomberg.com/news/articles/2015-05-21/russia-deployed-nuclear-capable-gear-nato-commander-says