That article isn't that good. Even the title is BS. Both countries started with their latest civil aviation efforts way before the sanctions hit.
Even the CR929, the idea for a joint Sino-Russian venture for that is from 2012 before Crimea was annexed.
Then you have quotes like this.
Russia and China can build an airplane together, but without avionics and other systems—not to mention engines—it will be just a “hollow shell.”
Right. But you would think Russia and China, with their huge MICs would easily manage to make avionics. I will give you examples. How much different do you think would be the avionics of an airplane like the CR929 compared to those of the Y-20? The H-6K also has a glass cockpit. The Russians are currently installing glass cockpits on the Tu-160 and Tu-22M3 bombers. Do you think they are purchasing those from foreign suppliers? That is bunk. As for the engines the Russians developed the PD-14 engine recently are are already working on the PD-35 engine doing subscale component testing. There is no reason to think they cannot develop an engine.