I don’t know what his calculations are. He could come to the US or Israel, and have a better chance of foregoing arrest. Maybe the Russians would be afraid to target a famous activist. Who knows.
US is heading to the same direction UK is and also extradits to UK.
Israel is a mixed bag. It has a significant and aggressive Muslim population.
Generally speaking nothing he did would be recognized as criminal in Russia. Russian hate speech laws generally require unambiguous calls to violence included to be recognized as offensive. Also Russia doesn’t extradite to UK.
He was deported from the US already for immigration fraud, he tried to use his brother’s passport for entry