If the issue is not resolved, the complainant can escalate it to the UN Security Council. The five rounds of indirect talks on Iran's nuclear program took place between Iran and the U.S. on April 12, 19, and 26, and May 11 and 23. The first, third, and fourth rounds of negotiations took place in Muscat, the capital of Oman, and the second and fifth rounds took place in Rome, the capital of Italy. On June 22, the U.S. launched military airstrikes on three Iranian nuclear facilities. It is reported that the airstrikes destroyed the Iranian nuclear facilities.