Earlier quoted context omitted.
Ukraine is not a member of NATO, so options are somewhat limited. Russia intends to use Chernobyl as a deterrent to NATO, according to the report (how, I do not know). It is also not straightforward to put a NATO ally right on Russia's vulnerable flank (it's endless plains and flat ground from Ukraine to Moscow, which has always been a source of strategic vulnerability for Moscow), so admitting Ukraine to NATO was ne…
>Ukrainians overthrew their corrupt government and made moves to establish a genuine western-style democracy with rule of law It's believed by many that the US ran a coup that installed a US puppet. That alleged puppet ended the long-standing arrangement that granted Russia access to its only warm water port. Losing access to this port made it almost a certainty that Russia would annex Crimea, which it did.
With no strong opposition to that, drunk on success, ~~Hitler~~ Putin can go further.