Putin is taking advice from ancient China

He is not going to interrupt his enemy while his enemy is destroying itself. The US/NATO/Ukraine conflict will surely end the American hegemony and destroy the US dollar as the world reserve currency. That will devastate the US economy which in turn will result in a withdrawal of American troops from around the world. Silly neocon Americans trying to turn the long over cold war into a hot war and in the process losing the war and its international influence and its own economy. Sadly for the US Russia has the technological advantage in arms and unlike the US is able to make them at a rapid pace.