The United Arab Emirates will not allow attacks on Iran to be launched from its territory, the foreign ministry said in a statement on Monday.

Last week, President Donald Trump said a US "armada" was heading toward the Gulf and that Washington was watching Iran closely after a bloody crackdown on protesters.

The foreign ministry said in a statement it "has reaffirmed the United Arab Emirates' commitment to not allowing its airspace, territory or waters to be used in any hostile military actions against Iran".

The UAE hosts thousands of US personnel at Al Dhafra airbase near the capital Abu Dhabi, one of several American military sites in the Gulf.

The UAE also refuses to provide logistical support for attacks, the statement said, adding that "dialogue, de-escalation, adherence to international law, and respect for state sovereignty" were the best way to address "current crises".