Surely the Russian ultimatum is good news?
Previously the Russians were perhaps forcing Ukraine to make the first move. Yes the Russians had brought in all the troops, the boat, and surrounded the Ukrainian base etc. But none of that had been violent, it was just I'm bigger than you bullying. If Ukraine had gone and defended themselves then they would have delivered the first punch and been seen as the bad guys (like how some people see what happened in Georgia).
Now that Russia has said "or else we attack" Ukraine should sit back and do nothing. Then Russia come & attack and boom, Russia definitively were the ones that started it.
They would also lose a lot of military personal - would that really be worth it?