Please explain what was different between Iranian and U.S relations before and after Biden’s presidency, and how that has impacted today’s situation.

Huh? That's a pretty far out there statement that needs substantial support to be taken seriousl.

By all accounts Israeli leadership also tried to rope Biden and Obama into attacking Iran, but they were stronger presidents that paid more attention to US interests rather than being easily tricked.

US pulling out of the JCPOA was the biggest travesty of the 21st century. No nation state will ever feel safe without a nuke now.

But Israel wanted to destroy Iran as competition. And they got it.

Agreed. And I'd say pulling out of the TPP is an equivalently big mistake, and will honestly have far worse consequences for the US but in far different ways. Letting China be the leader of the Pacific by pulling out, in combination with the terrible hostility to all countries there now, especially to South Korea, massively weakens the US economically and military. We just handed everything over, no fight, no fuss, no benefit to the US. Ugh.

The current situation we're facing can be traced back to, in some parts, Trump pulling out of JCPOA and Biden's tepid resistance to Israel's war in Palestine, leading to this situation.