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Interesting to think about the Ukraine invasion under Trump's nose. I'm guessing he wouldn't have lifted a finger
One of the plans was to have Erik Prince create a private $10 billion army and to consolidate Ukrainian military aircraft production into a consortium that could rival Boeing or Airbus in order to deny China and Russia access to scale their aircraft production.
Before the invasion Prince proposed the Biden administration to send ~150 retired US military planes (F15's, F16's, A10's etc.) to Ukraine along with contractor pilots. Creating an airforce as a deterrence against the invasion.
Given what happened with North Korea and the Abraham accords in the Middle East as well as ISIS and Soleimani I doubt that 'not lifting a finger' would've been Trump's strategy in case of a Russian invasion of Ukraine.
I don't think any US President can be blamed for the current situation even if the coup of 2014 was sort of the match that lit the fire.
It all comes down to Germany not willing to part with cheap Russian energy and Europe neglecting defense spending after the cold war ended and appeasing or helping Russia every step of the way.
Putin wouldn't have been able to stay in power without the likes of Rutte and Merkel.