So, I take it you agree that by destabilizing other governments it would be beneficial to Russia to prevent them from having the capacity to act in concert against Russian interests?
Destabilizing governments is done to enrich certain individuals and or exploit a country’s natural resources.Destabilizing other governments doesn't necessarily lead to chaos, but may prevent those governments from acting in concert against Russian interests, or in their own interests.
In this case, should the USA continue to be destabilized China will extract wealth via imports and resources via Chinese companies buying controlling interests in companies that control our natural resources.
Russia on the other hand will be free to extract wealth from Europe by exporting gas (and once they have Ukraine, wheat and steel) to Europe.