Kerry apparently expressed frustration with swelling ground war between Israel, Hamas.
"It's pretty clear that this was a system that was transferred from Russia," he said.
The West may have to "fundamentally change" its approach to Russia, he wrote.
International monitors were given less than three hours of limited access on Saturday.
The call came amid rising concerns about a cover-up at the crash site.
Moran called on Putin to take responsibility for his role in destabilizing eastern Ukraine.
Saturday's statement targeted Rep. Jim Moran (D-Va.).
Kiev also accused the rebel groups of seeking to carry away plane fragments to Russia.
Obama spoke to several world leaders on Friday, including German Chancellor Merkel.
Obama, Biden to discuss immigration with heads of Guatemala, Honduras and El Salvador.
State expresses concern over access to wreckage in eastern Ukraine.
Officials cast doubt rebels could fire a missile without "some measure of Russian support."
Kerry said he would travel to the region to try to broker a cease-fire.
The leader reportedly said rebels would hand over the black boxes to authorities.
The IDF said it would not fire on a neighborhood for two hours after Red Cross request.
The soldiers were killed by Hamas fighters who slipped through a Gaza tunnel.
It will be up to Kerry to defend Obama from criticism on foreign policy.
U.S. lawmakers criticized separatist groups controlling access to the site.
Rep. Ed Royce says groups are trying to cover up how Malaysia Airlines flight 17 went down.
Militia group says it's possible credit cards have been taken from site.
"Diplomacy takes time," Secretary of State John Kerry said in a statement.
"We stand determined to find answers about who is responsible," the House leader said.
A suit would make sure Russia pays a cost for Malaysia Airlines Flight 17.
Sen. Kirk also wants Justice Department to file wrongful death suit against Russia.