Belarus is an ally of Russia. Ukraine is a different animal. Putin wants a neutral Ukraine and wants to annex the Russian part of Ukraine as a buffer zone.
Maybe in 2010 Putin had imperial ambitions but that ship has sailed and Putin knows it.
He views Ukraine as a defensive war because Ukraine aided by NATO is national security threat for Russia
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"Russian part of Ukraine" is Russian propaganda myth. I personally know people from eastern Ukraine, their native language is Russian, but they don't consider themselves Russians and don't want to be part of Russia.
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Myth will become reality when this conflict ends. Ukraine doesn’t have the manpower and artillery and tanks to push Russia out of the east
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