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Syrian activists have reported about the arrival of two more Russian stealth jets at the Khmeimim air base in Syria.

"Thus, there are four advanced Su-57 stealth fighters in Syria," the WarJornal analytical platform, which monitors hostilities around the world, said on its Telegram channel on Friday, February 23.

Read alsoUSAF Gen.: Arrival of Russian stealth fighter jets to Syria to raise complexity for U.S.Russia has thus deployed two Su-57S and two Su-57 jets.

As UNIAN reported earlier, U.S. Air Force Gen. Mike Holmes announced on February 22 that the reported arrival of Russian stealth Su-57 fighter jets to Syria "raises the level of complexity for the (USAF) crew's to deal with."

The first two Su-57 arrived in Syria on February 22.

The fifth-generation Su-57, also known as the T-50, has been designed to compete with the U.S. F-22 Raptor and F-35 Joint Strike Fighter aircraft.