Iran's navy began annual drills near the strategic Strait of Hormuz on Sunday, state television reported.
Navy commander Habibollah Sayyari told state television that Iranian warships and helicopters would be participating in two days of war games in the Sea of Oman and the Indian Ocean, covering an area of 2 million square kilometers (772,000 square miles) surrounding the water channel.
The Strait of Hormuz, located between the Persian Gulf and the Gulf of Oman, is of strategic importance for several countries, because nearly a third of all oil traded by sea passes through it. The strait has been the scene of several previous confrontations between the US and Iran.
The US Navy's 5th Fleet, located in Bahrain across the Persian Gulf from Iran, declined to comment on the drills and did not reveal whether it planned to monitor Iran's military exercises.
The drills could increase the tension between the Washington administration and the Tehran government. During his campaign, Trump repeatedly criticized the nuclear agreement between Iran and the international community, including the United States, and promised to get tough with the Islamic Republic.
Last month, a US Navy destroyer fired warning shots at four Iranian vessels near the Strait of Hormuz after they closed in at high speed. Earlier this month, Trump imposed new sanctions on Tehran in response to a ballistic missile test.
Rouhani to stand again
Separately, an aide to the Iranian president, Hassan Rouhani, said the leader would be standing for a second term in elections on May 19.
Vice president for parliamentary affairs Hosseinali Amiri was quoted by the state news agency IRNA as he said that Rouhani "has reached the conclusion to take part in the presidential election."
In a speech on Sunday carried live on television, Rouhani said his government stood for opening the country up to the outside world while his opponents sought confrontation and isolation. "We are steadfast in our principles and we don't compromise on them," Rouhani said. "But we should talk to the world, engage and cooperate with it."
Rouhani was first elected in 2013.
mb/jm (AP, dpa, Reuters)