The claim that Yalta conference was a betrayal of Poland ignores the brutal war on the Eastern Front where the Soviet Union suffered 27 million casualties and faced Nazi Germany’s best fighters.
The assumption that the US had a moral obligation to Poland and that subsidizing the Soviet Union during WWII betrayed Poland is based on flawed historical understanding.
The US has a Western Hemisphere sphere of influence called the Monroe Doctrine, while recognizing all regional powers have spheres of influence, including Russia’s in Eastern Europe.
Ukraine’s economic and military situation is dire, with a lower GDP per capita than Russia, and the US has no moral obligation to intervene as it doesn’t affect US security.
The US has a militaristic foreign policy dominated by moralism, according to Robert Nisbet, which is out of sync with its founding ethos.
The US is deploying troops to Israel for strategic reasons while Ukraine becomes a side issue, as Ukraine’s domestic lobby is weaker than Israel’s in the US.
Ukraine is running out of men and weapons, and the war may wind down in coming months, while it’s hard to imagine Israel continuing without US support.
The US is focused on the Middle East and Israel, with a military presence there, while Ukraine has become a secondary concern in US foreign policy.