Ukraine’s defenses in the Donetsk region are continuing to crumble. In the past week alone, the Russians have gained more land than at any point this year. “The gain of more than 200 square kilometers (77 square miles) adds to territory taken in a grinding summer offensive that’s involved huge losses of Russian troops and equipment,” Bloomberg News reported, citing maps compiled by the DeepState open-source intelligence group’s map service maintained in cooperation with the Ukrainian Defense Ministry. “Russia has captured 1,146 square kilometers in Ukraine since Aug. 6, about a quarter more than in the first seven months of...