And here you know that this is pure propaganda. Lenin did not "give" this territory to Ukraine. It was a part of Ukraine when it declared independence in 1917 and was recognized as such by the Bolsheviks in the Treaty of Brest-Litovsk in 1918. These territories have a majority Ukrainian population. The only exception is Crimea, which has a majority Russian population and was transferred to Ukraine by Khrushchev in 1954.
Kind of destroys the argument that Putin longs for a return to the “glory” days of the USSR.