The main common interests are security and economic prosperity in the region. And the USA does not need it. And to do this, they turned Ukraine into anti-Russia, pumped up Nazis there - descendants of collaborators during the Second World War. Russia has launched a preemptive strike. "If a fight is inevitable, you need to strike first." If Russia had not done this, Ukraine would have attacked anyway, and in the West everything would have been presented as an attack by Russia, as it was in Georgia in 2008. Therefore, it simply made no sense to wait for this attack, or even more so to wait for Ukraine to acquire nuclear weapons, or for these American laboratories to make biological weapons.
And in a similar way, the United States and England operate all over the world. Taiwan, Japan, South Korea against China and the DPRK, Pakistan against India, Saudi Arabia against Iran, etc. - everywhere it is "divide and rule". Everyone should hate each other, fight against each other, except the Anglo-Saxons - this is the basis of their prosperity and supremacy in the world.