If Iran used chemical weapons on invading US troops, would it trigger nuclear retaliation and a wider world war?

Will US use Nukes in response? Iranians don't care If they get Nuked. They don't mind dying or Islam. Ayatollah didn't even try to hide. Accepted he was going to die.

Will Russia hit Ukraine with Nukes in response?

Will China's Navy attack US Navy?

Would North Korea attack US allies?

US would pull out US troops and respond with Nuclear Missiles killing millions of innocent Iranians
Russia would strike Ukraine with Nukes in response
North Korea would hit US Allies with missiles
China's Navy would attack US Navy
Nothing
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If Iran used chemical weapons on invading US troops, would it trigger nuclear retaliation and a wider world war?
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