Its more like Russian needs China shipyard and Chinese engineer to upgrade their Sov. The student has surpassed their teacher and become the master, now its Chinese need to teach them a few new things.well I guess MLU would've already involved Russian engineers who built the ships, refitting might actually be more complicated than building brand new ones
By now 051B (see below 167) and two of the Sov's (see below 136, 137) have completed MLU, the two 052B should be done soon (no pic yet, see CG by an enthusiast). One common feature between these refitted destroyers is that they all got YJ-12 supersonic ASh missiles which is also installed in Pakistani 054A/P.
Personally, I think PLAN should consider extend the service of #112 and #113 a few years beyond 30 years (2024-2025), mainly because of:-Rarely seen these days: Type 052 DDG (pennant #112) during a maritime training assessment in late December, 2021. After last MLU in 2011, both ships of this class (pennant #112 & 113) are expected to retire around 2025 after 30 years of service.
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I think they will be retired from combat service as planned, because experienced crew is kinda bottleneck for PLAN compared to rapid induction of new warships in the coming decade.Personally, I think PLAN should consider extend the service of #112 and #113 a few years beyond 30 years (2024-2025), mainly because of:-
1) to keep a larger pool of experienced sailors for future transfer to new destroyers build after 2025.
2) to maintain the numbers of surface combat ships during this time of geopolitical tensions with AUKUS, India and Japan.
I also hope that after retiring from active service, they can turn #112 and #113 into training ships, replacing the older ones consist of the obsolete type 053 FFG (#517 and #519).