It is the latest attempt by the United States to disprove Moscow's claims that it has nothing to do with pro-Russian separatists.
State Department spokeswoman Jen Psaki said as well as those from the Ukrainian authorities, images widely available in the international press or on Twitter indicate the men are Russian forces.
They "show either individuals or signs of a connection with... Between Russia and some of the armed militants in eastern Ukraine," said Psaki.
A series of photos provided by Ukraine to Washington through the Organisation for Security and Co-Operation in Europe (OSCE) shows an image taken in Georgia in 2008 of a man with a distinctive long red beard wearing the insignia of a Russian special forces unit.
We see the same man with the beard a little grayer in a photo taken at the recent capture of a police station in the Ukrianian town of Kramatorsk by separatist militants, and again in Slavyansk on April 14, according to the photos provided.
On his official blog, General Philip Breedlove, NATO's Supreme Allied Commander in Europe, outlines why he believes it is clear they are Russian forces.
Among the examples he gives: "The weapons and equipment they carry are primarily Russian army issue. This is not the kind of equipment that civilians would be likely to be able to get their hands on in large numbers.
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