U.K. Prime Minister Keir Starmer signed a 100-year partnership agreement with Ukrainian President Volodymyr Zelenskyy on Thursday, part of a European show of support and promises to keep helping Ukraine endure in its nearly three-year war with Russia.

British PM Starmer joins Ukraine's Zelenskiy to honor fallen soldiers at a Kyiv memorial::In his first trip to Ukraine since becoming prime minister in July last year, Starmer was keen to underline Britain's support for the nation just days before Donald Trump returns to power in the United States.