U.S. intelligence suggests pro - Russian militants shot down Malaysia Airlines Flight 17 . President Obama said Putin has the ` ` most control '' over the situation in eastern Ukraine . Sen. John McCain and Rep. Peter Welch said outright that Putin is ` ` responsible '' Ambassador to the United Nations Samantha Power said investigators ca n't rule out the possibility that Russia may have helped the separatists operate the complex missile system . ` ` Russia must end this war . Russia must end this war , '' the U.S . ambassador to the U.N. said .
U.S. intelligence suggests pro - Russian militants shot down Malaysia Airlines Flight 17 . President Obama said Putin has the ` ` most control '' over the situation in eastern Ukraine . Sen. John McCain and Rep. Peter Welch said outright that Putin is ` ` responsible '' ` ` Russia must end this war . Russia must end this war , '' the U.S . ambassador to the U.N. said .