Just seize this asshole on the Russian warrant and send him to Putin.
Freeze his assets for confiscation...they can pay for the Wall and some military upgrades. Have the CIA grab him (Mossad would surely help)...fly him to Moscow and turn him over to Russia. He can live his last years in a Siberian Gulag. If his kids come out of hiding, grab them too, Siberia is a big place, they have room for them there too.