a much better video describing the motives of the Russians is on the youtube channel "RealLifeLore" titled "Why Russia Is Invading Ukraine"
cliffs: natural gas in the Black Sea; shale oil in the Donbas and western Ukraine; restore the fresh water channel supplying Crimea that was dammed by Ukraine; part of a long range plan to expand westward to the Carpathian Mountains; stop Ukraine from collecting fees on Russian natural gas going to western Europe via pipelines crossing the Ukraine, best agricultural land in Europe.