Is There a Coordination Between Russia and China?

A few decades ago, it was seen as improbable that russia and china would ally in the way they have now. China is simultaneously seeking to become both rimland and land power only with the help of russia. They will knid eurasia to create terrestrial connectivity, north south and also westa east north south. It means, of course, given the climate change, if the arctic offers new opportunities with the northern sea route.