Note:
(a) On Nov 19 and 20, four transmission towers were blown up, culprits unknown. https://en.wikipedia.org/wiki/Transmission_tower
(b) Kerch Strait https://en.wikipedia.org/wiki/Kerch_Strait
(The strait is 3.1 kilometres (1.9 mi) to 15 kilometres (9.3 mi) wide and up to 18 metres (59 ft) deep; The most important harbor, the Crimean city of Kerch, gives its name to the strait)
(c) Novorossiysk https://en.wikipedia.org/wiki/Novorossiysk
(Russia's main port on the Black Sea [excluding those on Crimea])
(d) There is currently no English-language news reports on China's ship, though there are 11 in what looks like Russian.