"Military action is not an option, for obvious reasons," Mike Morell said.
The Afghan president expressed gratitude to the American people in an interview.
NATO said military action against Ukraine would amount to a breach of international law.
VIDEO | The conflict follows an uprising that swept pro-EU leaders to power, sparked unrest.
The Treasury secretary asked the pro-Israel group to support Obama's Iran policy.
“We are looking to de-escalate this,” an official said.
Obama is warning that the U.S. may be unable to protect Israel from greater isolation.
President Obama is poised to jump head first into peace talks between Israel and Palestine.
"They are lying and this government is a government of liars," the Florida Republican said.
John Kerry on Sunday blasted Putin's "stunning" choice to invade Ukrainian territory.