The current situation reflects broader geopolitical tensions rather than simply one side being unwilling to compromise. Your framing of "who's at fault" oversimplifies a complex diplomatic negotiation. They have been at war for 3+ years, it benefits all countries that another future war does not happen again, not just for Ukraine.
Besides Donald Trump is demanding 500 billion dollars in minerals from Ukraine for further support which is far more than their contribution so far of 120 billion dollars.