Maybe, but Bill Clinton recently:

>“We forced Ukraine to give up nuclear weapons, cruise missiles, and strategic bombers. We promised to protect Ukraine from Russia. We made Ukraine vulnerable. So yes, this is our war.”

He was the one who did the deal.

We can dig into the differences of "security guarantees" versus "security assurances" and the precise requirements in the text, but ultimately the disarmament of Ukraine made a promise to the rest od the world about the possibility of nuclear disarmament. And the question is whether it's possible to have security from Russia unless a country has nuclear weapons.

A defended Ukraine promised the rest of the world that they could be a country and not need to build nuclear weapons. An abandoned Ukraine means that every country needs to have nuclear weapons or the world will stand aside as nuclear powers invade every other country.

It's quite clear which world Trump wants to live in. As soon as North Korea got the bomb, he started acting sycophantically and weak towards North Korea.

We are entering a far more dangerous world, and as far as defense spending goes a far more expensive world by not giving Ukraine the conventional weapons it needs to defend itself.