CENTCOM launched a 12th consecutive night of strikes on Iran on Wednesday.
President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israeli strikes targeting military, government and infrastructure sites.
Delegations from the U.S. and Iran entered negotiations in June aimed at a war-ending deal based on a memorandum of understanding signed by both countries.
The U.S. and Iran have nonetheless continued to exchange strikes, with the strategic Strait of Hormuz the primary flashpoint.
An Omani diplomatic delegation visited Tehran for talks on the Strait of Hormuz, Iran's official Islamic Republic News Agency reported Friday.
The delegation will discuss mechanisms for governing the Strait of Hormuz, IRNA said.
Iranian Foreign Minister Abbas Araghchi told reporters that, "Iran has shown that it will not succumb to U.S. bullying and will not respond to the language of force, pressure, or threats in any way."
"We are neither afraid of threats nor will we succumb to pressure and will not tolerate the language of threats. We have a principled policy and we will continue to do so. Protecting the Iranian people and protecting Iran's interests in the Strait of Hormuz are among our principles and we will follow them," Araghchi said at the Council of Ministers of Foreign Affairs of the Shanghai Cooperation Organisation in Kyrgyzstan.
On negotiations, Araghchi said there was no issue with mediators, but that the problem lies with the United States' approach.
Israeli Prime Minister Benjamin Netanyahu will head to Washington, D.C., on Monday, at President Donald Trump's invitation, according to Netanyahu's office.
Netanyahu will meet with Trump at the White House on Tuesday and attend Sen. Lindsey Graham's funeral, Netanyahu's office said.
Iran continued to fire projectiles toward Kuwait, Jordan and Bahrain on Friday, with the countries confirming aerial attacks, military officials said.
Kuwait's armed forces said it is dealing with "hostile drones" from Iran.
In Jordan, air defense shot down seven missiles and six drones coming from Iran Friday, the armed forces said in a statement.
Bahrain's military said it "intercepted and destroyed several treacherous Iranian aerial attacks" on Friday.
-ABC News' Ayat Al-Taway and Ghazi Balkiz
