[TrackerFF]

Tactical nukes on strategic targets, if nukes will ever be used. While I think in general that the usage of nuclear weapons is "point of no return" action, I do think actual usage would be lower yield tactical nukes on strategic targes - compared to detonating Minutemen over Tehran, and similar high-casualty targets.

[microtonal]

Only as a start. It would greenlight Russia to use them in Ukraine and would escalate from there.