British Prime Minister Keir Starmer arrived in Ukraine’s capital on Thursday with a pledge to help guarantee the country’s security for a century. The British government says Starmer and Ukrainian President Volodymyr Zelensky will sign a “100-Year Partnership” treaty in Kyiv covering areas including defence, science, energy and trade.

Starmer’s visit is his first trip to Ukraine since he took office in July. He visited the country in 2023 when he was opposition leader, and has twice held talks with Zelensky in London since becoming prime minister.