"The things that Kerry said...are worrying," a Cabinet minister said.
Officials rejected assertions that recent separatist protests in eastern Ukraine are organic.
McCain said the attacks over the past few days are “of course” being orchestrated by Putin.
Paul said those who take a hard-line stance against it are “voting for war.”
Power said developments in eastern Ukraine have "all the telltale signs" seen in Crimea.
Members of Congress say Kerry's comments have set back the peace process.
The IPCC found greenhouse emissions have risen despite policies to reduce climate change.
Kerry expressed strong concern that pro-Russian gunmen orchestrated attacks in Ukraine.
The vice president will meet with officials ahead of Ukrainian presidential election.
The Treasury Department announced sanctions against six "Crimean separatists."