The Alaska perspective when it comes to hatcheries is that the large hatchery programs in Alaska are of two species, pink salmon and chum salmon, and primarily in two regions of Alaska. This is in south central Alaska in Prince William Sound and then southeast Alaska. Pink salmon are produced in Prince William Sound and chum salmon are produced in southeast Alaska.
Between those two species, over two billion juvenile fish are not released in rivers. They are released in the nearshore areas close to rivers, but they're actually purposely released away from major wild-stock rivers. They're designed to be separate from those wild stocks. There are no large-scale hatchery releases into the Bering Sea from Alaska that would be interacting with Yukon River chinook.
The hatchery fish that Yukon River chinook would be interacting with primarily would be Asian chum salmon from Hokkaido. The data are really, really poor from Russia. It's really not clear what Russia is producing, but it would be hatchery fish from places like Sakhalin Island in Russia, and then lots of wild production, wild chum salmon and wild pink salmon, from places like Kamchatka. Those are competing with Yukon chinook.
Simply put, the Alaska releases of hatchery fish interacting with Yukon River chinook I think is less of a concern, but hatchery fish in general in the Bering Sea in the north Pacific is an issue.