I think it would be the same as it was with the pandemic and with his lack of knowledge or understanding, he would run his mouth off and later say "I accept no responsibility".
Nato has been very clear it will not attack Russia, Biden has also said this, because that's the only option as it stands with a country with nuclear defence capability and a leader focused on attack.
So yes, the possibility that Trump would feel his "manhood" was threatened by Putin's demonstration (because Trump moved personally, not politically and definitely not democratically).
The other option is that he could have seen personal gain by supporting Putin. Because he already pulled out of other alliances and treaties that don't suit his personal profit margins, if profit and power were to be gained supporting Putin, he would do it I think.
He set the wheels in motion fir a few world issues in his time in power