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Russia is claiming a U.S. contractor is providing U.S. citizens, with U.S. military experience and training, to wear Ukrainian uniforms in Eastern Ukraine, and promote conflict with pro-Russian Ukrainian citizens.
http://en.itar-tass.com/russia/726890Russian Foreign Ministry wrote:“We are particularly concerned that the operation involves some 150 American mercenaries from a private company Greystone Ltd., dressed in the uniform of the [Ukrainian] special task police unit Sokol,” the ministry said. “Organizers and participants of such incitement are assuming a huge responsibility for threatening upon the rights, freedoms and lives of Ukrainian citizens as well as the stability of Ukraine,” the ministry added.