“Unlike in previous phases of the war, Russia has probably achieved reasonably effective coordination between at least two Groupings of Forces, the Central Grouping likely commanded by General-Colonel Alexandr Lapin and the Southern Grouping probably under the recently appointed General Sergei Surovikin,” the assessment states.

That’s a world of difference from the previous four months of war, during which Russian forces haven’t coordinated well, have faltered in their logistics and planning, and have been actively trying to sabotage their own attack plans rather than fight like a well-oiled machine.

It’s a particularly alarming development given that Russia likely won’t stop in Luhansk. The current U.S. assessment is that Russia still maintains plans to take all of Ukraine, not just eastern Ukrainian territories, a U.S. ambassador told The Daily Beast.

And in the coming days, Russian forces could be turning their attention to other territories in the east of Ukraine, including in neighboring Donetsk.