Iran's Foreign Minister Abbas Araghchi told his British counterpart Yvette Cooper in a phone call that any US use of British bases would be seen as "participation in aggression" against the Islamic republic.
It was not clear when the call with Cooper took place.
"These actions will certainly be regarded as participation in aggression and will be recorded in the history of relations between the two countries," said Araghchi, according to a statement released Friday by the foreign ministry, which did not say when the phone call took place.