Ukraine has pulled back troops near several villages in the northeastern Kharkiv region, where Russian forces have been advancing and bombarding settlements in a new offensive along the border. The military gave details of the withdrawal as U.S. Secretary of State Antony Blinken was on an unannounced visit to Kyiv, where President Volodymyr Zelensky urged him to speed up the delivery of U.S. weapons. Moscow launched a surprise major ground assault on the Kharkiv region last week as it seeks to make advances across the battlefield before Kyiv can marshall more arms and manpower. “In some areas,…