That is not true. I just read it. 

The memorandum committed the United States and Britain to seek UN Security Council assistance for Ukraine, but it did not commit those two countries take to military action with their own forces against Russia if it violated its commitments—as Russia did in 2014, when it seized Crimea and fought in Donbas, and in 2022, when it launched an all-out invasion. In response to Ukrainian questions when negotiating the assurances, U.S. officials said the United States would take action if Russia violated its commitments but that would not include sending American military forces.

The officials did not discuss specific steps Washington would take. That reflected failure, on the part of Americans and Ukrainians, to foresee in 1993-94 what Russia did in 2014 and 2022. Had Ukrainian officials foreseen those actions, Kyiv almost certainly would have sought more solid guarantees, which the United States and Britain were not prepared to give. Negotiations would have been at an impasse.