While the fuzzy nature of the front in Ukraine makes it difficult to assess territorial gains, analysts estimated that Kyiv’s forces clawed back about 100 square miles of territory during the first two months of the year. A small assist came from Elon Musk’s unexpected decision in February to block Russian troops’ access to his satellite internet service, Starlink. That gave Ukrainian forces a brief reprieve from drone assaults and more ease of movement, analysts said.