Doubts emerging about Strelkov's VKontake page:
A few days ago, the Donetsk People's Republic Twitter account tweeted a photo of a "Buk" missile launcher:
More from our news desk on Obama and Putin's call.
U.S. President Barack Obama and Russian President Vladimir Putin have spoken by phone about Washington's tough new sanctions against Moscow because of Ukraine.
The Kremlin said Putin had expressed deep disappointment to Obama over what he described as "another unconstructive decision" by Washington to introduce so-called sectoral sanctions against Russia.
The Kremlin added that Putin and Obama also mentioned the breaking news of the Malaysian airliner crash in Ukraine.
White House spokesman Josh Earnest did not give details about the presidents' conversation, but said the call took place at the Kremlin's request.
Obama announced on July 16 that the United States was imposing sanctions against two major Russian energy companies, two powerful financial institutions, some weapon-makers, and four Russians because of Moscow's support for separatists in Ukraine.
On the day the sanctions were announced, Putin said Washington was making a "mistake."
BREAKING: Putin and Obama have reportedly discussed the air crash in Ukraine.
Russian aviation expert being interviewed on RT saying that it is likely the plane was downed by the Ukrainian military.