You are in the wrong here. Putin did threaten to use nuclear weapon when he said “we will certainly use all the means at our disposal, this is not a bluff”. There is no misleading there. He tried to justify it by saying that’d be in response to some threat to Russia. We all know Nazi has been the justification for his invasion of Ukraine, no matter how ridiculous it is. Do you think he wouldn’t fabricate another threat to justify his use of nuclear weapon?
As for reporting it as threaten to use nuclear weapon as “first strike”, I haven’t seen any news that specifically mentioned “first strike”. Care to give an example?