evidence: Russia, which now controls just under a fifth of Ukrainian territory, has been advancing towards Toretsk since August. [...] Donbas, which covers the Luhansk and Donetsk regions, has since become the war's main theatre where some of biggest battles in Europe for generations have taken place. [...] Ukrainian media reported this weekend that six North Korean military officers were killed in a Ukrainian missile attack on Russian-occupied territory near Donetsk on October 3.