There's been a lot of loose talk about a 1994 "treaty" that obligates the US to guarantee the territorial integrity of Ukraine.

American Thinker

As Financial Times reports, this is vastly overstating the reality of our agreement with Ukraine...  John Lough, associate fellow of the Russia and Eurasia Programme at Chatham House, the foreign policy think-tank, said: “While this does not legally oblige the UK and other western powers to intervene, they might feel morally obliged to.”--- Rick Moran

 Hopefully, they won't "morally oblige" us into a major war.  Sheesh.