They want to end the Pentagon's business with Rosoboronexport.
A further Russian incursion will seriously escalate tensions, says Carney.
The two diplomats huddled for nearly four hours on Sunday.
It's the first delivery of American aid to Ukraine following Russia’s annexation of Crimea.
Former Ambassador Michael McFaul said the U.S. is in a weak position to negotiate with Putin.
The House Intel chairman said Putin thinks he is in a position of strength.
Sen. John McCain said it would be "tough call" to put pressure on big companies.
The House approved legislation Thursday that would provide loan guarantees for Ukraine, spend...
He says "small breakthrough" should be built upon.
Decision paves way for passage of Ukraine aid.
The bill comes as lawmakers bicker over reforms to the International Monetary Fund.
The conservative group is "key voting" against legislation with controversial IMF changes.
Sen. Kelly Ayotte (R-N.H.) said Thursday that she is writing a bill that would impose tough new...
“If the reports are true, we would welcome that as a step in the right direction.”
Kerry and his Russian counterpart discussed on Sunday deescalating the crisis, Kerry said.
The former CIA official said any movement would likely be met by a bloody insurgency.
Sergey Kislyak called the troop movements “normal exercises.”
Russia and the West have had an extended back-and-forth over sanctions.
The House and Senate passed similar but not identical bills on Thursday.
Move comes after weeks of squabbling between House GOP and Senate Dems.
Obama said members' defense cuts may have weakened the alliance.
President says he's concerned Russia won't stop with Crimea.
Obama and other leaders cancel G-8 meeting in Russia.
Obama's comments came as he kicked off a week of talks with European leaders.