Forget all that war making crap. Trump would have simply negotiated with the Russians to alleviate their concerns.
Trump would have tried, but I think most of the Russian “concerns” like NATO expansion were just propaganda. And I get the impression Russia didn’t negotiate in good faith. Russia was making rediculous demands in negotiation while amassing troops and claiming they had no intention of invading.
The real concerns were oil and gas, restoring the greater Russia, and getting Ukraine to officially surrender the lands Russia invaded in 2014 by taking over the rest of Ukraine.
Trump would have tried negotiating, but he would have ended up walking away and arming Ukraine. Which if you think about it, is exactly what he did when Trump was in office.