Ukrainian forces invaded Russia's Kursk region in August 2024 and remain there as of 20 February 2025 (Newsweek, BBC, ISW - Russian Offensive Campaign Assessment 18 February 2025). For the purposes of this question, "regular" ground armed forces would include military forces not considered Special Forces (Britannica - Special Forces). Whether Ukrainian regular forces have left Russia will be determined using open-source reporting and information published by the Institute for the Study of War (ISW). An official announcement from the Ukrainian government that its regular forces have left Russia will count.

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