Yesterday Nico Voorbach (ECA) said on Dutch TV that if Russia closes its airspace to European airlines, Russia would risk being kicked out of ICAO
I think he's talking out of his posterior. The EU line appears to be that Russia could legally close its airspace if it wished to:
"Helen Kearns, the spokeswoman for the European Commission, the EU's executive arm, said there had been no official information on this from Russian authorities.
Russia could legally close its airspace if it wanted to, according to the EU Commission. Currently, each EU country has a bilateral deal with Moscow on whether its airlines can fly over Russia."
Shares in European airlines drop after report claims Russia considering limiting airspace - Bridge River Lillooet News