Iranian President Masoud Pezeshkian is set to visit Moscow on Jan. 17 and sign a cooperation agreement with Russian President Vladimir Putin, Russian state news agency RIA cited Iran's ambassador to Russia as saying on Thursday.

Masoud Pezeshkian is expected to sign an agreement on cooperation between Tehran and Moscow with Russian President Vladimir Putin on Jan. 17.

Russia’s top security agency says it has arrested four Russians accused of making preparations to kill senior Defense Ministry officials on Ukraine's orders.

Igor Kirillov, who was named the head of Russia’s nuclear defense forces in April 2017, was under sanctions from several countries including the U.K. and Canada for his role in Ukraine.

Russia's aviation watchdog said on Thursday all four Moscow airports had resumed work after the lifting of temporary restrictions that were introduced to ensure the safety of civil aircraft flights.

All four of Moscow's airports including another about 100 miles southwest of the Russian capital were temporarily shut down for undisclosed security concerns, authorities said.

"To ensure the safety of civil aircraft flights, temporary restrictions have been introduced on the operation of Sheremetyevo, Domodedovo, Vnukovo, Zhukovsky and Kaluga airports," Rosaviatsiya said on Dec.