The replaced DTT in action, as received in Romania from Kherson...
One thing I'd missed is that the Russian channels on the 14°W T2-MI feeds have the same service IDs as the channels on the Ukrainian DVB-T2 multiplexes, which isn't the case for other Russian T2-MI that service regions within Russia.
How that works in practice is shown in that YouTube video - when fed through the transmitters in place of Ukrainian DTT, the Russian channels magically appear under the old Ukrainian channel labels without the receiver needing to be retuned...