Saudi Arabia and the United Arab Emirates condemned Iran’s missile attack on Monday evening against the Al Udeid US military base in Qatar. Riyadh called the strikes an “aggression” against Doha and were “unacceptable and cannot be justified”.

After the missile strike, Iran’s National Security Council said the attack was aimed only at the U.S. base and not at Qatar, calling the Gulf nation a friend and brother.

The escalating tensions are starting to affect airlines beyond the Middle East, where major flight routes have already been cut off since Israel began strikes on Iran on June 13.