well he has claimed he will only launch nukes if anyone "intervenes" in Ukraine. I've no idea what the fuck that means anymore considering the U.S is not stopping the weapon supplies, and said weapons are becoming deadlier and more advanced, and the U.S personally told Russia to fuck off this week when threatened to stop doing all that.
I think by Putin's logic that is more than just "intervention." And also the "fuck off" is a huge wound to his ego.