Hours after Iranian nuclear physicist Mukhsin fahrizad was killed in the attack, US Navy officials said on the 28th that the “Nimitz” aircraft carrier battle group was returning to the Gulf. < / P > < p > an official of the US Department of Defense said that the order of aircraft carrier deployment was made a few days ago, originally to ensure the safe withdrawal of US troops from overseas battlefields, but at the same time, it can “release signals to Iran”. < / P > < p > Rebecca rebarlich, spokesman of the US Navy’s Fifth Fleet, said in an e-mail statement sent to the media on the 28th that the “Nimitz” aircraft carrier battle group began to return to the Gulf on the 25th, which is related to the US withdrawal from Afghanistan and Iraq, not triggered by specific threats. < / P > < p > “this move will ensure that we have enough ability to deal with any threat in the withdrawal, and to deter the enemy from any action that we want to take against our troops.” < / P > < p > the U.S. military has sent Nimitz class aircraft carriers to the Gulf for many times, and Nimitz is one of them. The carrier crossed the Strait of Hormuz in September and then reached the Gulf. Information from the US Navy shows that the “Nimitz” aircraft carrier combat group docked at the port of Bahrain in early November, and then joined with multinational naval ships to participate in the “Malabar” joint naval exercise in the northern Arabian Sea. < / P > < p > CNN reported that the decision to send the aircraft carrier back to the Gulf was made before the killing of the Iranian nuclear physicist, which was originally to ensure the safe withdrawal of the US military, but at the same time it could “release a signal to Iran”. Fahrizad was attacked in a village on the outskirts of Tehran, the capital of Iran, on the 27th, and died in hospital. The Iranian government has identified Israel as linked to the attack. Iran’s Supreme Leader Ayatollah Ali Khamenei on the 28th called for severe punishment of those who were associated with the killing of fahrizad. < / P > < p > for the time being, Iran has not directly responded to the latest trends of US aircraft carriers. However, Iran’s permanent representative to the United Nations, Majid taht rawashi, warned the United States and Israel not to take “risky actions” on the 28th. < / P > < p > Iran has always opposed the presence of the navy of the United States and other western countries in the Strait of Hormuz, and regularly conducts military exercises near the Strait. Iran’s Islamic Revolutionary Guard held a military exercise in the Gulf in July. One of the simulated targets was a model US aircraft carrier placed in the Strait of Hormuz. Iranian media reported at that time that from the appearance, the model aircraft carrier is very similar to the Nimitz class aircraft carrier in active service of the US Navy. < / P > < p > the relationship between the United States and Iran has become more tense since 2018. The United States unilaterally withdrew from the comprehensive agreement on Iran’s nuclear issue and restored and added sanctions against Iran. In response, Iran suspended part of the terms of the agreement in stages from May of the next year.