You are applying western thinking (acquiring captive markets, NATO is a force of good, surely not threatening) to Russia. Big fail, they think differently.

It is obviously clear that Ukraine is not about securing resources: Given the costs of war (Russia knew the sanctions will be coming, just did not think their funds will be frozen), the cost-benefit is simply not there. Given the obvious economic drawbacks of attacking Ukraine, the only explanation that makes sense is the national security one. You go to war to 'test capabilities' only if it is a minor thing without serious consequences, which Ukraine war definitively does not fit.