Russian President Vladimir Putin has called on Ukrainian troops in the Russian region of Kursk to surrender, as diplomatic back-and-forth continues over a potential US-brokered ceasefire with Ukraine.

A strong Ukrainian force invaded Kursk in August, aiming to seize a swathe of Russian soil that Ukrainian President Volodymyr Zelensky could eventually trade back to Russian Presi

President Trump and President Vladimir V. Putin both claimed that Ukrainian forces were surrounded. Ukraine’s top military commander vowed to “hold the line.”