On the night of 29-30 November, an explosion occurred on the Baikal-Amur Mainline in the Severomuysky Tunnel, named after Vladimir Bessolov, located in Buryatia (Russia).
Source: Ukrainska Pravda’s source in the security forces
Details: The source notes that this is actually the only major railway connection between Russia and China. And currently this route, which Russia uses, specifically for military supplies, is paralysed.
Trans Siberian went all the way around the Chinese border before they were allowed to shorten it by going through China.