Prior to world war 1 there was no such concept as Ukrainian. It was the border region of the Russian empire for centuries.
Long term projects by Czechs, Poles and Austrians, attempted to tear ethinic Russians away from their identity under Austrian occuption in the western border lands of the Russian empire.
Occupied Russian people were economically and socially coerced to identify as Ruthenians/Ruthenes/Rusyns/Rusnaks.
This was built on top of previous attempts at converting them religiously from Christian Orthodoxy to a new hybrid between that and catholicism called the Byzantine Church or Uniate Church. Slowly transforming the local population by means of language, ethnicity and religion into something artifificial.
After world war 1, Vladimir Lenin granted Ukraine an artificial identity. Its name became Ukraine meaning "Border Region". This identity was a member republic of the Soviet Union. At this time there was still no such thing as a codified Ukrainian language, nor is there one today, nor do a majority of Ukrainians even speak Ukrainian but rather Russian or various Russian dialects.
Stepan Bandera the notorious Nazi and Russophobe, funded by the CIA during ww2, rallied followers from Galicia (eastern Polish lands), to support Hitler and massacre Russians.
These nazi elements were not wiped at the end of ww2 completely by Stalin, and have been revived now under Peto Poroshenko and Volodomyr Zelensky.
from 2014 to 2018 14, 000 ethnic Russians, mostly women and children were brutally tortured and murdered by Azov Batalliion and other nazi armies in the Ukraine.
Putin was criticised heavily in Russia for waiting 8 years to intervene and protect Russians under ethnic cleansing attacks from Ukraine.
Here we are today. The Ukraine was granted independence by the Soviet Union based on NEUTRALITY and nuclear disarmament.
The deal for unifying Germany was "NOT ONE INCH EASTWARD" for NATO. NATO expansion into the Ukraine and statements from its president wanting to re-arm nuclearly and the ethnic genocide were the "incentives" (reasons) for the Russian invasion.