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US concerned about Russian troops on Ukraine border

Troops from a pro-Russian militia prepare to travel in a tank on a road near the town of Yanakiyevo, Donetsk region, eastern Ukraine, Friday, June 20, 2014.

A buildup of Russian troops along the Ukrainian border and the establishment of defense "cordons" by Russian authorities are troubling developments, the White House said on Friday.

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"There is mounting evidence that shows a buildup of Russian military forces on the border with Ukraine," White House Press Secretary Josh Earnest said. "We will not accept any use of Russian military forces under any pretext in eastern Ukraine."

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—By Reuters