The article addresses this:
Putin made one last attempt at diplomacy at the end of 2021, tabling a draft U.S.-NATO Security Agreement to forestall war. The core of the draft agreement was an end of NATO enlargement and removal of U.S. missiles near Russia. Russia’s security concerns were valid and the basis for negotiations. Yet Biden flatly rejected negotiations out of a combination of arrogance, hawkishness, and profound miscalculation. NATO maintained its position that NATO would not negotiate with Russia regarding NATO enlargement, that in effect, NATO enlargement was none of Russia’s business.
The continuing U.S. obsession with NATO enlargement is profoundly irresponsible and hypocritical. The U.S. would object—by means of war, if needed—to being encircled by Russian or Chinese military bases in the Western Hemisphere, a point the U.S. has made since the Monroe Doctrine of 1823. Yet the U.S. is blind and deaf to the legitimate security concerns of other countries.
So, yes, Putin went to war to prevent NATO, more NATO, close to Russia’s border. Ukraine is being destroyed by U.S. arrogance, proving again Henry Kissinger’s adage that to be America’s enemy is dangerous, while to be its friend is fatal. The Ukraine War will end when the U.S. acknowledges a simple truth: NATO enlargement to Ukraine means perpetual war and Ukraine’s destruction. Ukraine’s neutrality could have avoided the war, and remains the key to peace.
As someone who claims to hate violence and war, you should pay special attention to the last sentence there. The war didn't even need to happen in the first place and could have been avoided entirely if Ukraine had remained neutral. BRICS is not a military alliance, NATO definitely is. Furthermore, not long after the war started, a peace agreement between the two warring parties was deliberately sabotaged by Western powers. The West wanted to keep the war going:
How Britain Sabotaged Ukraine Peace
On April 16th, Foreign Affairs published an investigation, documenting in forensic detail how in May 2022 Kiev was a signature away from a peace deal with Russia “that would have ended the war and provided Ukraine with multilateral security guarantees,” which was scuppered by Western powers.