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This appears to be two Ukrainian Su-27 fighter jets flying over Odesa, and some reports suggest they were escorting United States B-52s bombers in the area. 
Update: This is kinda crazy, this was the first time in history US strategic bomber that are capable of delivering a nuclear payload entered the Ukrainian airspace.
Wow!! US B-52s near Crimea.
Three B-52s buzzed around #Ukrainian airspace. Wow https://twitter.com/aircraftspots/status/1301829692794662912
Might have been three of them, but what’s interesting to note they flew outta #Poland into #Ukrainian airspace. https://twitter.com/archer83able/status/1301805938651942914
https://twitter.com/archer83able/status/1301805938651942914
Update: The brits got involved too!! Wow https://twitter.com/ukdefjournal/status/1301853456689508352
For context, I’m not saying this is related but key to know. The Pentagon released video of a Russian Su-27 fighter jet turning directly in front of a B-52 over the Black Sea last Friday.
More juicy info on #Ukraine B-52 fun this morning. https://twitter.com/thewarzonewire/status/1301918117606555648
