"In line with the order of the President of Russia, two advanced airplanes with special helicopters will be sent to Tabriz with 50 professional mountain rescuers within an hour," Levitin told Mokhber in his second call on Sunday.

He added that "On Monday morning, two Russian helicopters will leave for Tabriz from Armenia."

"The Russian government and Mr. Putin are concerned about the safety of Dr. Raeisi and his accompanying team and express their greetings, respect and sincere sympathy with the leadership and the great nation of Iran at this time," the Russian official also said.

A helicopter carrying President Ebrahim Raeisi and foreign minister Hossein Amir-Abdollhian and some other officials in East Azarbaijan Province went missing and in a dense forest and mountainous area in East Azarbaijan on Sunday, while bad weather conditions are hampering search and rescue efforts.