One thing to think about is the size of the borders. The DPRK/PRC border is 880km. The DPRK/USSR border is 17 km (with a single rail bridge).
The USSR would really need to secure the area around Vladivostok early as it is not only almost within tube artillery range from Chinese territory (sub 45k IIRC) but a Chinese push of only 20km in that area could sever the DPRK/USSR border completely.
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