This is true, but I don't think it's likely that NATO would admit Ukraine. For example, look at Georgia's history of trying to join NATO. For over a decade now Georgia has been a huge ally of NATO and Coalition forces (e.g. in Afghanistan) and has tried to join NATO, but the reality is that if NATO were to allow Georgia (or Ukraine) to join NATO it could precipitate a huge armed conflict with Russia.
That being said, it's also possible for NATO to form strategic alliances with countries bordering Russia without explicitly making those countries NATO members. Therefore I think it's in Russia's interest to exert pressure on these countries and make it explicit that partnership with NATO and the West may lead to armed conflict.