Make of this what you will, but, if true, it’s making it even easier for Putin to take Sea of Japan from the Tumen River. Below are maps.
See that mark just south of Vladivostok? That’s the Tumen River.
The map below is old and what is not revealed is that Tumen has been drudged and straightened until there’s not even a 45 degree angle. 15km up the river from SOJ, there are bridges and a large train trestle (at least 5 tracks) near Khasan which can be dropped to block any subs that might try to follow Russian/Chinese subs back into the safety of the base further north of it. Of course, it can work the opposite for them, should US decide to drop them before Russian/Chinese try to flee, but it is a meatgrinder plan to begin with. If Russia/China forces have their way, it will drive Western naval forces back to The HI, and US govt is presently preparing bases on various islands (incl. Maui).
If you could take Japan at an even lesser price as Taiwan (avoiding breaking thru Korea Strait), which would you choose? This was the reason for all the meetings between Biden/Japan/So. Korea at Camp David and other locations in 2023. Note: Taiwan was not even invited.