I'd imagine it's rather politically complicated. Beefing up force postures in this area would inevitably raise suspicion in Russia and NK, even if the intention is made clear.
You also need long term certainty to make such expansion a worthy investment as the payoff requires transiting Russian/NK airspace. Ideally the PLA would not just be limited to defending the area, but would also take the initiative and actively conduct operations over the Sea of Japan, or even Japan itself during wartime, especially in a way that would force Japan to redirect its forces away from Ryukyu. How would these operations complicate Japan–Russia relations? Such an expansion would also be substantial and would essentially dominate the region with regard to Russia and NK, especially with six gens and the H-20 factored in.
Then there are questions about whether the PLAN will participate in the Sea of Japan and whether this would involve Haishenwai (would the Tsushima Strait be considered untraversable during the conflict). Unlike in the Ukraine war where China's direct involvement is difficult, Russia would be much more likely to be directly dragged into this conflict.
So in some sense, the Ukraine War has done us a factor. But please Wang Yi and Zhang Youxia, keep those 战略互信 Strategic Mutual Trust coming.
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