This would appear to be at the core of the article
The first issue is something of a moot point. NATO has expended and now touches Russia from the Artic to the Black Sea. Sorry Vlad. Why not have a go at NOT sending troops into neighbouring countries? Be a "good" neighbour. Acknowledge (like the UK have had to do) that your Empire/Hegemony was founded on fear and conquest and it is falling apart. As Princess Leia would tell you, the tighter you try to hold onto something the more will it slip through your fingers. NATO enlargement as a "Casus Belli" is bourn from their own deeds and actions. The repeated invasion of neighbouring states with extreme violence is not ever going to endear you to them. Hence the attitudes of the Fins, Baltic States, Poland and others. Russia is not trusted and has historically behaved as an aggressor with an expansionist agenda. To claim that those states entering a defensive pact is a threat to their security is nonsense, a convenient scare story for their own population but with little credibility elsewhere.
Secondly, Crimea. Russia no historical right to Crimea. It was taken by force from the Ottoman Empire by Peter the Great in 1774 establishing an independent Tatar state. In 1783 Catherine the Great annexed it and subsequent attempts to re-establish such a state was probably stopped by the mass deportation of over 200,000 Tatars to Siberia under Stalin. So the Russian claim to Crimea is one based on a desire for a naval base in the Black Sea. They have one at Novorossiysk, make do with that. Sevastopol is a symbol of Russian prestige that is true, but one to which they have little historical right. Portraying Sevastopol as "fundamental to Russia's national security" is just further rubbish. Novorossiysk is one reason but there is another very simple geographical reason, the Bosphorus. You cannot deploy a "blue water" navy from Sevastopol.
This ill conceived adventure was always doomed to failure once the SMO descended into chaos, Russia could never successfully occupy a resistant Ukraine. That they have persisted is down to Putin and his enablers who cannot countenance failure as that will in all likelihood lead to their own loss of power (and probably a heart beat)
Oh and the "Minsk Agreements" were negotiated to stop the fighting AFTER the 2014 invasion of Ukraine by Russia and were largely broken/ignored by Russian "agents" the DPR and LPR who were signatories to the agreement.