Iran, Russia and China on Friday began a joint naval drill in the Indian Ocean aimed at boosting marine security, state media reported.

Iran’s state TV said 11 of its vessels were joined by three Russian ships including a destroyer, and two Chinese vessels. Iran’s Revolutionary Guard will also participate with smaller ships and helicopters.

The report said the maneuvers would cover some 17,000 square kilometers, or 10,600 miles, in the Indian Ocean’s north, and include night fighting, rescue operations and firefighting drills.

This is the third joint naval drill between the countries since 2019. It coincided with a recent visit by Iranian President Ebrahim Raisi to Russia that ended on Thursday.

“Improving bilateral relations between Tehran and Moscow will enhance security for the region and the international arena,” Raisi said upon returning from Russia on Friday, the official IRNA news agency reported.

Read More: Times of Israel

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