June 8 (Reuters) – Ukrainian forces have recaptured more than ⁠600 ⁠square km of territory so ⁠far this year, Ukraine’s top military commander Oleksandr Syrskyi said ​on Monday, the latest sign of shifting momentum after years of slow but relentless Russian gains. In ‌May alone, Ukraine recaptured 100 square ‌km more of territory than it lost, Syrskyi said on the Telegram messaging ⁠app. Syrskyi did ⁠not specify where the gains took place, saying only that in certain ​areas of the 1,200 km (800-mile) frontline, Ukrainian forces continued to maintain the initiative. President Volodymyr Zelenskiy also said last month that Ukraine had recaptured around 600 square km in 2026. Reuters was not able ​to verify the assertions. Independently determining lines of territorial control in Ukraine is ⁠difficult because ⁠of drone warfare that ⁠has created ​a wide no-man’s land “kill zone” along the front. But independent groups that map the battlefield ​have also reported Russia’s ⁠total advances slowing or reversing in recent months, for the first time since a failed Ukrainian counter-offensive in 2023. Syrskyi said Russian …