How? Trump rather infamously stood up at a press conference and said, in effect, he trusted Putin more than his own intelligence agencies. The only real anti-Russia thing done during his administration that I can recall is the Magnitsky Act, but the clear impetus for that came from Congress and Trump only very reluctantly signed it.
Words are not policy.
Biden stopped selling weapons to Ukraine and removed sanctions on Nord stream 2.
https://www.politico.com/news/2021/06/18/white-house-ukraine...
(before invasion) Despite appeals from Ukraine, Biden admin holds back additional military aid to Kyiv amid diplomatic push
https://www.nbcnews.com/politics/national-security/appeals-u...
Biden administration slowed Ukraine arms shipments until his term was nearly done
https://www.reuters.com/investigations/biden-administration-...
Nord Stream 2: Biden waives US sanctions on Russian pipeline
That being said, the war has to end. Pretending like it could go on indefinitely, as Biden and Europe did, is infantile.