Unlikely that this will happen but if we are playing a game of escalation perhaps he could deputise people with access to millenary equipment. Remember, the armed forces pledge allegiance to the constitution and nobody else. They also have the duty to not follow an illegal order.

That and reneging on past promises. Bet Ukraine regrets giving up their nukes on a promise from the US for protection.

What’s even more troubling for nuclear proliferation reduction efforts is the weight any such promises will have in the future: “no thanks, I’ll keep my nukes, thanks-you I don’t want to me Ukrained”.