WASHINGTON (AP) -- President Barack Obama is warning Russia "there will be costs" for any military maneuvers it launches in Ukraine, a move U.S. and Ukrainian officials say they believe to be already underway.
Officials say Obama may retaliate by canceling a trip to Russia this summer for an international summit and could also cut off trade discussions with Moscow. But it's unclear whether those moves will have any impact on Russia's calculus in Ukraine, which is at the center of what many see as a tug of war between East and West.
Defense Secretary Chuck Hagel says that -- in his words -- "this could be a very dangerous situation if this continues in a provocative way."
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