Trump's behavior prior to the election informs what his behavior would've been after the election. Before the election he was attempting to weaken the Ukrainian military, and he was never stingy when it came to complimenting his dream daddy Putin.
Ahh there we go. Can never stray too far from what Trump is telling you to think, eh? He's a morbidly obese geriatric pedophile with narcissistic personality disorder. Get better role models already.
The Russian economy and stock market is literally dead, and Putin has repeatedly bitched about the sanctions. I'm not sure what else you expect Biden to do, short of dragging us into World War 3 with a moderate to high chance of total nuclear annihilation. Trump would be more likely to nuke Canada than get into a conflict with his biggest financier, we already saw that demonstrated when he abandoned the Kurds to Putin's brand of imperialism.
Trump never tried to weaken the Ukrainian military - he was using leverage. I didn’t hear the same pearl clutching when Obama withheld aid to Ukraine, Pakistan, Colombia, Philippines, Egypt, Honduras, Mexico, the list goes on. At some point people on the left will have to accept that not everything is Orange Boogeyman’s fault - Biden showed weakness towards Russia numerous times, lifting restrictions on their pipeline and escaping from Afghanistan in a hurry (this one gets blamed on Trump too, even though the Biden withdrawal did not proceed to plan at all). At the end of the day there were two periods of Russian aggression against Ukraine - one under Obama and one under Biden. Trump always held the facade of the guy with the big button, and that worked perfectly fine against both Putin and Kim. It wasn’t “presidential”, he got criticised for cosying up to dictators, but ultimately there weren’t any dead Ukrainians in the streets. The whole point was to create the image of a guy you’d rather be friends than enemies with, and it was effective, like it or not. I also disagree with your take on “praising Putin” - I’ve read the statement and it does not come across as praise, it’s an accurate assessment of a strategic decision. He said specifically that Putin’s brilliant for using a peacekeeping justification, especially given the timing. Putin expected the west’s response to be toothless, and so far the only sanctions are economic, so it is toothless in a way. In slightly different circumstances, ideally during summer, Ukraine could have well fallen by now. Putin’s mistake was rush - complete lack of preparation in case blitzkrieg doesn’t work out. Now we’re weeks into the conflict and western powers had to respond in one way or another - if Putin’s plan worked and Kiev fell within the week, a peace treaty would be drafted by now and nobody would dare to huff or puff about it, just like last time. Ukrainians are extremely lucky that the stars aligned in their favour, and that the Russian military showed every sign of incompetence possible, in spite of having an overwhelming advantage. That’s all besides the point though - the war didn’t start because of Trump and the Ukrainians aren’t winning because of Biden. This conflict revolves solely around Putin and his delusion of grandeur. He misses the good ‘ol Soviet Union. Never trust a red.