Maybe Russia should claim any agreements they made with the West 30 yrs ago are null and void because they’re no longer the Soviet Union. Two can play this game.
Ok, let’s just insist on enforcing the agreements Russia made with Ukraine in the 1990s. By those agreements, if Ukraine gives up nukes Russia will never invade, and Crimea belongs to Ukraine.
It seems that many people have difficulty comprehending the fact that Putin is a KGB gangster to whom treaties mean nothing.