"Any idea why the Russians skipped this? Something to do with not wanting to play in the US?"
No idea, but especially Karjakin and Grischuk have been quite open with their political views and maybe that could be connected to their declining to play in the USA, but that is just speculation.

Well.....no disrespect to MVL but you know what I mean....
Sergey showed great grit in Norway and it would have been fitting to have the youngest ever grandmaster as part of the strongest ever tournament. Plus Karjakin is one of those players who doesn't have any mental blocks and plays long brutal chess building fortresses that nene engines struggle to comprehend
Any idea why the Russians skipped this? Something to do with not wanting to play in the US?
fabelhaft wrote:
"If instead of MVL , Karjakin had played this would have been chess-gasm"
Well MVL is sole second and has more than showed that he deserved to be invited after Karjakin declined, and it isn't much separating the two anyway, 1.8 Elo at the moment.