I think generally for the EU/UK level it's still officially at the level of "requesting" their registered airlines to avoid.
TBF it looks like most UK/EU operators are doing as requested.
However if FR24 is to be believed some cargo operators, including some N reg ones, don't seem to have any many or inhibitions about continuing overflight.
For example Thurs AM at 1040 UTC there's a Fedex flight (FDX21) westbound over Belarus to the south of Minsk