Does this video show Russian paratroopers landing in Ukraine? No, that's not true: It is an old video of a military training exercise.
The video showed up in the wake of Russia's invasion of Ukraine on February 24, 2022. An example is this tweet published by @ on February 24, 2022 (archived here), which reads:
BREAKING; Russian military paratroopers landed in Ukraine, near Kharkov. . . . #UkraineRussiaConflict #Ukraine #Russia #WWIII #WW3 #Kiev https://t.co/HTB6AVv2WL
This is what the post looked like on Twitter at the time of writing:
(Source: Twitter screenshot taken on Thu Feb 24 07:28:57 2022 UTC)
However, weather in Kyiv is currently overcast as the livestream of Maidan Square in Kyiv, Ukraine shows:
(Source: Screenshot taken on Thu Feb 24 07:29:42 2022 UTC)
The video appears to be at least several years old, most likely from the Vostok military exercises in 2018: