Earlier quoted context omitted.
Does not seem particularly high right now, TBH.
It's not particularly high when there is an active war between Russia and an almost-NATO country, supported by NATO, with fighting happening right at NATO borders? I would say it's perhaps never been higher since the Cuban missile crisis.
The West being aligned with Ukraine would prevent Ukraine from getting nuked in an extended conflict.
That being said, there would have been no extended conflict for Ukraine without the West's assistance, they simply wouldn't exist without the international assistance, reducing the chance of Russia using a first strike against Ukraine to 0.