If Trump nuked Iran, could it trigger Russia to nuke Ukraine next?

Trump is talking about Nuking Iran again. Will he? If he did would Russia Nuke Ukraine or could they? What happens then?

Yes, Trump should Nuke Iran even if Russia Nukes Ukraine in response
No, Trump should not nuke Iran because it could lead to an expansion of war
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If Trump nuked Iran, could it trigger Russia to nuke Ukraine next?
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