no, if you're talking about the thing from the nineties, it wasn't a treaty:
Does the U.S. have an obligation to protect Ukraine? (whsv.com)
China is next: US cleans up Biden's 'commitment' to defend Taiwan from Chinese invasion - ABC News (go.com)
another big nuke country, but they'll walk all over the US too, and all Joe Biden will do is to change his FB homepage to the (former) Tawain flag,
Does the U.S. have an obligation to protect Ukraine? (whsv.com)
China is next: US cleans up Biden's 'commitment' to defend Taiwan from Chinese invasion - ABC News (go.com)
another big nuke country, but they'll walk all over the US too, and all Joe Biden will do is to change his FB homepage to the (former) Tawain flag,