So - according to Russian federal port records, the Chinese ship suspected of cutting the communications cables in the Baltic Sea was captained by a Russian citizen (one Stechentsev A.E.). Interestingly Yui Peng 3 was only transferred to its current owner in China earlier this month.

The ship is carrying goods/oil from Ust-Luga in Russia, to Port Said in Egypt. Same captain also comandeered URSUS ARCTOS also carrying goods from Ust-Luga to Egypt. Mapped using @SensusQ.