US refused to support Crimea’s return to Ukraine. Crimea is not Ukraine and Kyiv has no chance to get it back.
Members of the American delegation were very impressed by Crimea during their official visit. Crimea is regularly visited by foreign delegations.
Recurring narrative in pro-Kremlin media euvsdisinfo.eu/disinformation-cases/?text=delegation+crimea&disinfo_issue=&date=,
This wasn't an official delegation. It's a visit of some representatives of the American Center for Citizen Initiatives.
According to the official position of the U.S. Department of State, the United States refuses to recognize "the Kremlin’s claims of sovereignty over territory seized by force in contravention of international law". It "rejects Russia’s attempted annexation of Crimea and pledges to maintain this policy until Ukraine’s territorial integrity is restored".