"Us guaranteed ukraines borders"... it wasn't just the US...Russia agreed to guarantee borders
"The Budapest Memorandum on Security Assurances, signed on December 5, 1994, was an agreement where Ukraine disarmed its nuclear weapons in exchange for security assurances from its nuclear powers: Russia, the United States, and the United Kingdom, which included a commitment to respect Ukraine's independence, sovereignty, and existing borders and to refrain from the threat or use of force against its territorial integrity or political independence. France and China also gave individual assurances in separate documents" (from google AI)
So you may notice Europeans were in on the guarantee, not just USA... so why the heck don't you mention them, especially Russia's guarantee.
I remember when this was signed, thinking "If I were Ukraine I'd keep five or six nukes "just in case". Russia has a history of mass killings of Ukrainians. Look it up.