You will always have this risk, as long as this monster is alive.
I hope there are sane, peace-loving Russian people in Putin's military who can disable his nuclear capabilities.
Ideal scenario I suppose is that the sanctions hurt the Russian elite enough that they oust Putin (which would mean assassinate Putin). Probably the only (or at least safest) way to bring him down is from the inside. Whether that's oligarchs or top military officials, or some combination of the two, who knows, and who knows if it's even remotely likely.
Russian foreign policy, as subtle as a drunk bear
TBH, talking of drunk bears, I'd welcome Yeltsin back about now.