Some Russian units have returned to Belarus after suffering heavy battlefield losses in Ukraine, according to the United Kingdom Ministry of Defence (MoD) in an intelligence update Wednesday.

The units will need to reorganize and resupply in Belarus, in what the MoD said was an indication of the logistical difficulties Russia is having in Ukraine.

“Russia will likely continue to compensate for its reduced ground manoeuvre capability through mass artillery and missile strikes,” the update reads.

Some background: Russia’s Defense Ministry said this week it will “drastically reduce military activity” on two fronts — Kyiv and Chernihiv — following in-person talks between Russia and Ukraine in Istanbul. Instead, Russia said it will now focus more of its offensive on the Donetsk and Luhansk regions of Ukraine’s far east.

The UK said it believes this shift to be a “tacit admission that it is struggling to sustain more than one significant axis of advance.”