The United States is not against the shelling of military facilities in the Crimea
Ukrinform
The US agrees, "Crimea is Ukraine." Therefore, Ukraine can use strikes on the peninsula for self-defense.
This is reported by Politico, citing an anonymous senior official in the US presidential administration.
Of course, we do not choose targets, and everything we have provided to Ukraine is for self-defense purposes. Any target they decide to pursue on sovereign Ukrainian soil is, by definition, self-defense,” the official said.
When asked if the White House considers the peninsula a sovereign Ukrainian territory, he replied: "Crimea is Ukraine."
An unnamed Ukrainian official confirmed that the message had reached Kyiv.