Iran warned it would firmly respond to any move threatening its security, saying the US was responsible for any action taken by its ally Israel. The Israeli army said its Defense Forces and US Central Command (CENTCOM) launched Juniper Oak, a joint drill Sunday focused on air defense, cyber security, intelligence, and logistics. Some 6,400 US and over 1,500 Israeli troops, over 140 aircraft, 12 naval vessels, and artillery systems are taking part, making it the nations' largest-ever joint drill. Juniper Falcon is part of the ongoing strategic cooperation between the Israeli and US armies and is complementary to Juniper Oak. "The exercise will focus on aerial defense, cyber and spectrum, intelligence and logistical scenarios, and will test joint US-Israeli readiness for potential security events," said the Israeli army. The new maneuvers come amid renewed Iranian-Israeli tension following a drone attack against a military facility on Jan. 29. Relations between Iran and the West have been strained over Tehran's nuclear program and ita supplying of Russia with weapons and long-range drones in its war against Ukraine. Meanwhile, Iranian Foreign Ministry spokesman Nasser Kanaani said Iran would take "decisive and serious" actions against security threats and those behind them. Kanaani indicated that Iran had responded to Israel's attacks against its security, reiterating Tehran's position against any action by the United States and Israel in the region that would compromise its safety. Washington is responsible for any move by Tel Aviv because the US is Israel's ally and supporter, he asserted, saying the "Zionist entity should consider its turbulent domestic situation." Moreover, he said Israel was too weak to make a military move against Iran, remarking that it has “tasted Tehran's firm response.” On Friday, Iran announced that its security forces arrested the main perpetrators of the attack on Isfahan. "So far, the involvement of mercenaries of the … Zionist regime [Israel] in that act has been proven," reported the state news agency IRNA. Furthermore, Kanaani said Tehran prioritizes lifting sanctions during negotiations to revive the 2015 nuclear deal. He welcomed the Iraqi mediation to restore diplomatic relations with Saudi Arabia, hoping it would lead to progress in the negotiations between the two countries. The spokesman addressed regional countries, saying cooperation is the best solution for maintaining security. Kanaani criticized French Foreign Minister Catherine Colonna, saying her statements would not affect the course of resolving the issues and misunderstandings between Iran and European parties. On Friday, Colonna told her US counterpart, Antony Blinken, there must be a stronger "international response" to the threat posed by Iran's ballistic missiles program. He stressed that the missile program is defensive and based on legal rights, international norms, and principles.