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.

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

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