Literally leasing a very important port city (Sevastopol) to the Russian navy counts for nothing?
That’s so much more cooperation than talking with NATO or “aiming to get closer ties with the EU”. Not to say that Russia had tons of trade deals with the EU, so does Morocco and everyone who wants something in that region.
If I had to guess if say Putin saw NATO expansion as a problem but rather slow and so not urgent. Whereas EU expansion could actually be a worse because of how quickly it spreads. Not least because countries seeking deeper trade ties with the EU are basically committing themselves to anti-corruption reforms and thereby slipping from his grasp long long before any serious talk of NATO is happening (see: Georgia, or my long summary elsewhere in these threads)…