Do you understand why Russia is "our" enemy?

From the perspective of a soldier, the enemy is the enemy and you don't ask why. But from the perspective of leaders and diplomats, relationships are hyper complex, and friend/enemy don't cut it anymore. And anyhow, even if you thought of Russia as an enemy, that needs to always be re-evaluated.

So why should Russia remain an enemy?

From a geopolitical strategic perspective, according to John Mearsheimer, it would have been far better to get Russia on the US side of the ledger so that US and Russia together could contain China.