Ukraine was never considered "different" from the larger Russian and Slavic civilization, except by some ultranationalists living on the western 1/4th of the country bordering Poland. If you had visited the country before this whole nonsense started 9 years ago, you'd not be saying this. Russian and Ukrainians are not having any grouse against each other as people except those on the far western regions of Ukraine. Even today, they switch between Ukrainian and Russian and mix them up while conversing. It is like you guys mixing Urdu and Punjabi while talking.
Import oil from alternate sources...
Bruh, do you even know the logistics that go into establishing new alternate routes for oil pipelines? This isn't some fish market logistics that goes into establishing such an extensive network to become an alternate in no time. By the time such a deal is confirmed, entirety of north-west Europe would freeze to death. What do you think this whole Turkey-Syria falooda that is going on in the Middle East is for? Azerbaijan can become an alternate supplier but the Europeans don't want to depend on a bigger power - Turkey.
Russians have no interest in occupying Western European countries. They want to keep the old lines between East and West intact. This nonsensical fear mongering campaign is being run by Neo-Liberal vassal politicians of the US to stay relevant.
Why would Russia destroy its biggest oil & gas customer in the Western Hemisphere? Oil & gas is literally the third only product after weapons and power plants that Russia exports to earn major revenue.
NATO has been expanding since the dissolution of the USSR by dangling the carrot of extending EU membership unto itself "as an option".