The original attack was planned to disrupt the Russian elections, and was to take place at the Crocus Hall during the Shaman concert on March 9th. The alert issued by the US was very specific, "in the next 48 hours". By all accounts, the security was very, very heavy that night. The speculation is that it dissuaded the terrorists, one of whom was photographed before that night at the hall. Obviously, the Russians did take the warning seriously. But no one said anyone about a terror attack after the election, when it would seem to be moot. Except that, of course, the US immediately said that this attack, which showed Putin's impotence, would surely lead to regime change. Because that's how they "think".
The Mighty Wurlitzer dropped the meaning of the acronym of ISIS when they moved them out to attack other enemies of the US. When "ISIS", Islamic State for IRAQ and SYRIA, showed up in the Philippines, when Duarte displeased the US, i wondered how anyone could fall for it. And yet......
Early in the Trump presidency, Trump warned Russia about an "ISIS" plot to blow up a Russian plane.
The Mighty Wurlitzer went wild with rage, and the entire Establishment denounced Trump and called him a "traitor", for saving the lives of Russian civilians.
Obama The Great certainly didn't do that in October 2015, shortly after Russia came to the rescue of Syria, and the response was to blow up a civilian plane, killing 224 Russians, including children. Why couldn't Trump be more like Obama?
According to the Blob, "protecting sources" was far more important than saving lives. Yes, that is what they said.
But now we are told by the same sources that the US gave a warning to Russia about the "ISIS" attack in Moscow, and the Russians ignored it, because "Putin Evil" (like Trump, his co-conspirator, doncha know.)
I call bullshit.