The impact of Tuesday's explosion "is no less than the destruction of the cruiser Moskva," tweeted Ukrainian official Anton Gerashchenko.
The jet was reportedly downed near Alchevsk, a city in the Luhansk region and one of the areas where Vladimir Putin's war is focused.
Britain's defense ministry has repeatedly assessed that Russia's air force has underperformed since the Ukraine war began.
Russia is now using retired personnel who are working as contractors for Wagner, a Russian private military company, to conduct close air support missions, the U.K. Ministry of Defence said.
Russia has been failing to consistently deliver since Vladimir Putin launched a full-scale invasion against Ukraine, British intelligence said.
The air war has gone badly for Russia since its invasion of Ukraine was launched three months ago.
The retired Russian Air Force major general was reportedly killed on Sunday while flying an Su-25.
"Zelensky doesn't really need a no-fly zone," an expert told Newsweek when discussing Russia's failure to establish air superiority in Ukraine.
Ukraine's successful deployment of Turkish drones has also led some experts to accuse Russia of poor planning.
Ukraine's military has developed since 2014, but there are concerns over Moscow's superiority in the air.
The J-20 fifth-generation heavy stealth fighter brings China into a class only occupied by the world's leading military powers: the U.S. and Russia.
U.S. air presence over the Black Sea angered Moscow.
Engine trouble is currently believed to have caused the deadly crash at sea.
The exercise by China and Russia started the same day that the U.S., South Korea and Japan practiced underwater.
The Pentagon says Russia caused violent turbulence, but Moscow's former air force deputy commander says the U.S. should not have been in the Black Sea.
As Tu-22M3 supersonic bombers blasted the last of ISIS in Syria, Russia announced the new Tu-22M3M fitted with missiles that can soar 130,000 feet and attack 620 miles away.
The treaty promotes political trust between nations by allowing them to schedule and fly unarmed observation jets through each others' sovereign space.
The combat drills are underway during a tense time for the Korean Peninsula.
Russia's military flights over the Baltic have forced NATO to regularly scramble planes.
The Tupolev Tu-154 plane was unarmed and is one of over a dozen flights over foreign territory Russia has carried out as part of the same initiative.
Russia's sixth generation of fighter jets is not even here yet, but are its onboard anti-missile defenses simply incredible?
Russian jets have been caught near NATO skies twice recently.
Russia made threats to retaliate in several ways after the U.S. Navy shot down a Syrian regime aircraft Monday.
A crowd of Russian aircraft, including Tu-160 supersonic bombers, had three air forces tracking them.
Russian jets often fly near NATO territory, prompting scrambles. How is it able to make these reconnaissance flights?