@Vod
Great so your evidence that Russia might have deliberately staged a false flag terrorist attack in Moscow last night is links referring to the a false flag operation to justify the invasion of Finland in 1939 and the invasion of Czechoslovakia in 1968.
As for "the little green men" in Crimea these were Russian special operations soldiers sent in to back up pro Russian paramilitaries. They had their insignia removed so Moscow could have plausible deniability. But this is not a false flag operation- at no point did they attack Russians or Russian interests.
As for your statement :
"It's also a very mainstream view that the Russian regime has allowed and exploited Chechnyan terror attacks, particularly in 1999"
It might be a mainstream view amongst tin foil hat wearing conspiracy nut jobs but the reality is that it remains very much disputed.
Firstly because if the rational was justification for the invasion of Chechnya then one or two bombings would have sufficed, secondly to organise a FSB operation to create a sustained false flag bombings would have been impossible to keep secret and thirdly despite what you think of the Russian military they genuinely do not and would object to the killing of their own citizens.