It might be a good idea for the US to stand up for Ukraine’s territorial integrity, and it is true that the
Budapest Memorandum commits Russia to respect Ukraine’s sovereignty and territorial integrity (I thought
Russia’s president wanted to respect international law?). The UN Charter does that anyway.
The Memorandum does not in anyway obligate any country to intervene in order to guarantee Ukraine’s territorial integrity.
In other words, it is not a security guarantee, like the kind that the US has with Japan. It is also not a formal treaty which, at least under US law, would have more binding impact. So relax, American doves, it’s 2014, not 1914. International agreements will not lead us blindly to war (sorry, Ukraine!).