Iran begins new military exercises after threat to close strategic Strait of Hormuz.

Associated Press - Iran’s powerful Revolutionary Guard began military exercises Saturday in the country’s south, the latest show of force after threats to close the strategic Strait of Hormuz in retaliation for tougher Western sanctions.

Plans for new Iranian naval games in the Persian Gulf off the country’s southern coast have been in the works for weeks. State media announced new maneuvers in southern Iran involving ground forces, but it was not immediately clear whether they were part of the planned naval training missions scheduled for this month or a separate operation.

The latest military maneuvers got under way following stern warnings by Iran’s Supreme Leader, Ayatollah Ali Khamenei, about any possible U.S. or Israeli attacks against Tehran’s nuclear facilities. It also comes after Western forces boosted their naval presence in the Gulf led by the American aircraft carrier USS Abraham Lincoln.

Iran officials and lawmakers have repeatedly said that their country would close the Strait of Hormuz at the mouth of the Persian Gulf in retaliation for sanctions that affect Iran’s oil exports. They have as yet made no attempts to disrupt shipping through the waterway, the route for one-fifth of the world’s crude oil, and the U.S. and allies have said they would respond swiftly to any attempts at a blockade.

Last month, Iran’s navy wrapped up 10 days of exercises in the Gulf, but the Revolutionary Guard — which is directly under control of the supreme leader — represents a significantly stronger military force and controls key programs such as missile development. Iranian state media announced the new maneuvers, but gave no further details.

Khamenei, in a speech nationally broadcast on Friday, staked out a hard line after suggestions by Israel that military strikes are an increasing possibility if sanctions fail to rein in the Islamic Republic’s nuclear program.

He pledged to aid any nation or group that challenges Israel and said any military strikes would damage U.S. interests in the Middle East “10 times” more than they would hurt Iran. The comments also may signal that Tehran’s proxy forces — led by Lebanon’s Islamic militant group Hezbollah — could be given the green light to revive attacks on Israel as the showdown between the archfoes intensifies.

The West and its allies fear Iran could use its uranium enrichment labs — which make nuclear fuel — to eventually produce weapons-grade material. Iran insists it only seeks reactors for energy and medical research.

Israel has so far publicly backed the efforts by the U.S. and European Union for tougher sanctions that target Iran’s crucial oil exports. But Israeli leaders have urged even harsher measures and warn that military action remains a clear option despite Western appeals to allow time for the economic pressures and isolation to bear down on Iran.

Iran’s oil minister repeated claims that an EU oil embargo will not cripple Iran’s economy, claiming Saturday that the country already has identified new customers to replace the loss in European sales that accounted for about 18 percent of Iran’s exports.