Let’s also consider the stances of those countries on a nuclear first strike:
- China: Unambiguous “No First Use”, with no exceptions
- Iran: Doesn’t even have nukes and afaik has been cleared of ever trying to do so by international inspectors
- Russia: Reserves the right to use nuclear weapons if WMD are deployed against itself or its allies or if the very existence of the state is threatened with conventional warfare
- The US: Still has full first use.
For fun, the other countries with nukes:
- The UK: Has openly stated they will use nukes in a pre-emptive strike, officially has no stance on a “No First Use” policy in order to “keep its enemies guessing”
- Israel: Doesn’t have nukes (winkwinknudgenudge) but would 300% use them if they did
- India: No first use against states without nukes
- Pakistan: Full first use.
- North Korea: First use if they get attacked