Woulda, coulda, shoulda. Ask the people in the Ukraine if they believe the invasion is "one shallow claim" that "holds little water." Ask them if they are better off now that Biden is president. After that, ask them if life was worse for them when Trump was president.
Also, Trump didn't " publicly agree that Ukraine was part of Russia." He was "quoted" by the proverbial "anonymous source" as allegedly saying "
Crimea is Russian because everyone who lives there speaks Russian". The article went on to say "
It is unclear whether Trump’s comments were throwaway remarks said in jest, or whether he was signaling a radical departure from current US foreign policy." https://www.buzzfeednews.com/article/albertonardelli/trump-russia-crimea
I know it's reflexive to blame Trump for the invasion in your circles, but:
"First of all, Russia had grabbed Crimea and started a long-running war in eastern Ukraine in 2014, long before anyone had any notion that Donald Trump would run for president, let alone win. It clearly didn’t take Trump to give Putin the idea that he could get away with invading Ukraine — he invaded Ukraine and got away with it under the administration of Barack Obama, when, by the way, Joe Biden was vice president."
"Biden advisers now admit that the sanctions back then were too timid, a concession that they let Putin off too lightly. Surely, that must have figured into the Russian leader’s calculation whether to invade yet again."
"Then, there’s the fact that
Obama steadfastly resisted providing Ukraine lethal aid —
after it had already been invaded. Bipartisan opposition to Obama didn’t move him. He believed deeply in the appeaser’s logic that it would be too “provocative” to give Ukraine weapons simply to defend itself."
Again, Trump had nothing to do with this misbegotten decision — indeed, he criticized it."
"Trump’s offense in 2019 was to delay military aid — including Javelin missiles — that Congress had approved for Ukraine, in a reversal of Obama’s policy. Trump never should have engaged in this self-interested gamesmanship, but he released the assistance by September 2019."
"And it wasn’t Trump who told Biden to execute a
humiliating withdrawal from Afghanistan, to give Putin the gift of a summit after he menaced Ukraine the first time, to remove sanctions on the
Nord Stream 2 pipeline, to speak forthrightly about Western divisions at a pre-invasion press conference or to forgo pre-emptive sanctions."
https://nypost.com/2022/03/14/no-biden-fans-trump-didnt-cause-the-ukraine-war/