literally all the Russians have to do is stop and go back home and the war is over. they will never do that because they elected a President who is named Putin and now he has a Hitleresque dream of taking all the old Soviet vassal states back. He is the one doing this and he is the one you will have to convince to stop; although I am sure there are plenty of yes men that he has attracted to his orbit to support his crazed dream of Soviet restoration