He again denied Tehran’s involvement in weekend attacks on Saudi Arabia’s oil facilities, which dramatically ratcheted up tensions in the region this week. Zarif said Yemen’s Iranian-backed Houthi rebels, who claimed responsibility for the attack, have stepped up their military capabilities and are capable of conducting a sophisticated operation such as the one that knocked out half of the kingdom’s energy production.

Probed further, however, Zarif was unable to provide proof that Houthis launched the drones and missiles.

“I cannot have any confidence that they did it because we just heard their statement,” said Zarif. “I know that we didn’t do it. I know that the Houthis made a statement that they did it.”