Su-34 & Su-35 Jets besides two Mi-8 Helicopters were downed over airspace over the Bryansk region of the Russian Federation on May 12-13.
Vladimir Rogov, a member of the main council of the administration of the Zaporozhye region, said on Telegram "two Mi-8 helicopters and two aircraft fell in the mentioned region in one day: a SU-34 fighter-bomber and a Su-35 fighter of the Russian Aerospace Forces."
While not confirming the multiple crashes, the Russian MoD said, "a Mi-28 military helicopter crashed during a training flight in Crimea, with both pilots killed in the crash."
According to some reports one of the Mi-8 was a Mi-8MTPR-1 electronic warfare helicopter equipped with with the Rychag-AV active jamming station on board. It was providing EW support to the Su-34 bomber and Su-35 fighter which had taken of to attack targets in the Chernihiv region.
The Rychag-EW station was created for jamming radar guidance systems for air defense systems and enemy aircraft at a distance of more than 100 km.
Videos posted on social media show a helicopter hit by a smoking projectile and then slowly spiral out of control before falling to the ground. Other video show burning wreckage of purported aircraft claimed to be the fighter jets.
The fate of crew member in all four aircraft is not known. Some reports say they are presumed to have perished in the crashes.
Some pro-Russian social media handles reported about a helicopter being downed from MANPADS by Ukrainian saboteurs who had entered Russian territory adding that Russian special forces are looking for them in the Bryansk region, Klintsovsky district.