TEHRAN, Iran — Iran has given Russian commercial pilots working in the Islamic Republic two months to leave the country because it has no need for them, Transportation Minister Hamid Behbahani said.

The move is a further sign of strains between Iran and Russia, as Russia has indicated that it could back new sanctions against Tehran over its disputed nuclear work. For its part, Iran has voiced frustration over Moscow's failure to deliver a missile defense system.

Iran's semiofficial Fars News Agency reported that the idea to order the Russian pilots to leave the country gained momentum after a Russian-made aircraft caught fire as it landed in northeastern Iran in January, injuring more than 40 people.

The plane belonged to Iran's Taban airline, but the pilot was Russian, Fars said. It did not say how many Russians currently worked as pilots for Iranian airlines.

"Upon an order from the president, the Road and Transportation Ministry has set a two-month deadline, upon the expiry of which all Russian pilots will have to leave the country," Behbahani told Fars in a report published Saturday.

"When our country itself possesses plenty of professional and specialist pilots, there is no need to bring in pilots from abroad," he said.

Iran has suffered a string of crashes in the past few decades, many involving Russian-made aircraft. In 2009, a Tupolev aircraft flying to Armenia caught fire in midair and crashed, killing all 168 people on board.

U.S. sanctions against Iran have prevented it from buying new aircraft or spare parts from the West, forcing it to supplement its aging fleet of Boeing and Airbus planes with aircraft from Russia and other former Soviet states.

Behbahani said about 120 aircraft out of 193 planes in Iran's commercial fleet were currently active, with the rest grounded for one reason or another.

Russia, which has significant trade ties with Iran, is among six world powers trying to find a diplomatic solution to the long-running dispute over Tehran's nuclear program.

Moscow has indicated that it could support new sanctions against Iran provided that they are not too severe. Iran denies Western accusations that its nuclear work is aimed at developing bombs.

Iranian officials have voiced growing frustration at Russia's failure to supply the advanced S-300 missile defense system, which Israel and the United States do not want Tehran to have. Russia last month said it would not sell weapons if it leads to destabilization in any region.