Ukraine faces a “pretty grim” situation in Donetsk Oblast in the east of the country as Russian forces make some of their swiftest advances since the summer of 2022, according to experts and OSINT analysts. “The last week has been extremely difficult for the Ukrainians — the Russians were able to breach the Ukrainian defenses in various areas,” Emil Kastehelmi, an analyst at the Finland-based Black Bird Group, told the Kyiv Independent. Russia’s long and grinding campaign in Ukraine’s eastern Donbas region has dramatically gained pace in recent days, with Kastehelmi saying Moscow’s forces have…