Baghdad ? Iraq deployed security forces Saturday near a remote oil well seized by Iran, officials said, and its government pressed Tehran to withdraw its forces from the area along their disputed southern border.

U.S. officials applauded Iraq for standing its ground against Iran — an uneasy ally that analysts said was aiming to remind its neighbor of its economic and political pull in its takeover of the oil well Thursday. The site is in one of the largest oil fields in Iraq and has about 1.5 billion barrels in reserves.

The standoff was a dramatic display of the occasionally tense relations between the two oil-rich nations that fought an eight-year war in the 1980s but now share common ground in Shiite-led governments.

“Again, we ask Iran to be committed to the good relations that they announced with Iraq and its nation, and to withdraw its forces immediately,” Iraqi government spokesman Ali al-Dabbagh told Al-Arabiyah TV. “This is the demand of Iraq, and we call Iran to be committed with that.”

Iran, however, appeared undeterred.

In a statement, the Iranian military denied it violated Iraq’s sovereignty and cited a 1975 border agreement in claiming the oil well as part of Iran’s territory.

“Our forces are on our own soil and, based on the known international borders, this well belongs to Iran,” the Iranian military said in a statement to Iran’s Arabic-language Al-Alam satellite television.

Iraqi army and police reinforcements were sent to a staging ground about a half-mile from well No. 4 at the al-Fakkah oil field, according to two Iraqi officials close to the site. Both spoke on condition of anonymity because they were not authorized to discuss the issue with the media.

One official said Iranian soldiers came and went from the oil well throughout Saturday. They were gone by the evening, leaving behind an Iranian flag mounted at the well, the official said.

The oil field, parts of which both countries claim as theirs, is about 200 miles southeast of Baghdad. It was unclear how many troops were involved, and Iraqi forces barred journalists from approaching the area.

The standoff spurred an emergency meeting of Iraq’s national security council and high-level diplomatic talks between Baghdad and Tehran. U.S. officials, already worried about Iran’s growing influence in the region, praised what they described as Baghdad’s quick but measured response to the dispute.

“It does speak to the overall view here that they are not going to be pushed around by Iran,” U.S. Ambassador to Iraq Christopher Hill told reporters.

Iran’s ambassador to Iraq, Hasan Kazemi Qomi, said he would use “diplomatic and technical mechanisms” to soothe tensions. A spokesman for Iran’s Foreign Ministry accused foreign media of trying to “disrupt good relations” between Tehran and Baghdad.

Experts said it is doubtful that Iran is seeking to provoke Iraq, its only other Shiite-led ally in the Middle East.

Instead, Iran appears to be reasserting its place as having the world’s second-largest oil reserves at a time when Iraq is looking to cash in on their own, said Alex Vatanka of the Mideast Institute, a Washington think-tank.