Reporter: If Russia continues to indicate without evidence, that Ukraine played some kind of role in the terror attack, just how worried is the White House about that, and Russia using that to justify it's war in Ukraine?

Jean-Pierre: This was a terrorist attack that was conducted by ISIS. Mr. Putin understands that; he knows that very well. There is absolutely no evidence that the government of Ukraine had anything to do with this attack. We've been very clear about that…ISIS bears the sole responsibility here…there is no evidence, absolutely no evidence, that Ukraine is involved here.