You say Russia moved Russians into the Ukraine like they were some sort of illegal immigrants.
That is not the case.
Khrushchev gave the Ukraine sovereignty over Russians who had lived in the Donetsk and Crimea for over 400 years.
But none of that mattered until the Ukraine started acting like a traitor.
For example, stealing gas and oil from Russian pipelines, and trying to join NATO.
Both of those do justify the invasion of the Ukraine, since the Ukraine had almost a decade to fix their mistakes, and continued with their crimes instead.
As for justification for murdering civilians, let us not forget we in the US murdered about half a million innocent Iraqis over deliberate WMD lies.
Comrade, why do you keep lying?
Soviet period[edit]

Soviet Russian propaganda poster from 1921 that says "Donbas is the heart of Russia"
In April 1918 troops loyal to the
Ukrainian People's Republic took control of large parts of the region.
[26] For a while, its government bodies operated in the Donbas alongside their
Russian Provisional Government equivalents.
[27] The
Ukrainian State, the successor of the Ukrainian People's Republic, was able in May 1918 to bring the region under its control for a short time with the help of its
German and
Austro-Hungarian allies.
[27]
During the 1917–22
Russian Civil War,
Nestor Makhno, who commanded the
Revolutionary Insurgent Army of Ukraine, was the most popular leader in the Donbas.
[27]
Along with other territories inhabited by Ukrainians, the Donbas was incorporated into the
Ukrainian Soviet Socialist Republic in the aftermath of the Russian Civil War. Cossacks in the region were subjected to
decossackisation during 1919–1921.
[28] Ukrainians in the Donbas were greatly affected by the 1932–33
Holodomor famine and the
Russification policy of
Joseph Stalin. As most ethnic Ukrainians were rural peasant farmers, they bore the brunt of the famine.
[29][30]
Donbas was greatly affected by the
Second World War. In the lead-up to the war, the Donbas region was racked by poverty and food shortages. War preparations resulted in an extension of the working day for factory labourers, whilst those who deviated from the heightened standards were arrested.
[31] Nazi Germany's leader
Adolf Hitler viewed the resources of the Donbas as critical to
Operation Barbarossa. As such, the Donbas suffered under Nazi occupation during 1941 and 1942.
[32]
Thousands of industrial labourers were deported to
Germany for use in factories. In what was then called Stalino
Oblast, now
Donetsk Oblast, 279,000 civilians were killed over the course of the occupation. In Voroshilovgrad Oblast, now
Luhansk Oblast, 45,649 were killed.
[33] The 1943
Donbas strategic offensive by the
Red Army resulted in the return of Donbas to Soviet control. The war had taken its toll, leaving the region both destroyed and depopulated.
During the reconstruction of the Donbas after the end of the Second World War, large numbers of Russian workers arrived to repopulate the region, further altering the population balance. In 1926, 639,000 ethnic Russians resided in the Donbas.
[34] By 1959, the ethnic Russian population was 2.55 million.
Russification was further advanced by the 1958–59 Soviet educational reforms, which led to the near elimination of all Ukrainian-language schooling in the Donbas.
[35][36] By the time of the
Soviet Census of 1989, 45% of the population of the Donbas reported their ethnicity as Russian.
[37] In 1990, the
Interfront of the Donbass was founded as a movement against Ukrainian independence.