Ukrainian forces invaded Russia's Kursk region in August 2024, creating a major shift in the country's efforts to push Russian forces out of their country (AP, El País). 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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The question closed "Not before 19 February 2025" with a closing date of 19 February 2025.

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