Is the Irtysh River the choke-free Arctic shipping gateway that China needs?

As conflicts around the world highlight the vulnerability of global shipping lanes, China and Russia are reportedly weighing the possibility of turning a vast river into an inland cargo route to the rest of the world.
At the heart of this ambition is the 4,248km (2,640-mile) Irtysh River, which originates in China’s western Xinjiang Uygur autonomous region and runs through Kazakhstan before flowing into Russia’s Ob River and ending in the Arctic Ocean.
To China, this river-to-sea shipping route...