King Charles posed with Ukraine's President Volodymyr Zelensky ahead of their Coalition of the Willing meeting at Windsor Castle.
Photographers captured a striking photo of the two leaders as they took their salute before inspecting a Guard of Honour.
King Charles wore a crisp grey three-piece suit and black leather oxfords, conveying a serious tone through his facial expression.
Earlier in the week, King Charles and Queen Camilla attended an ecumenical service in the Sistine Chapel with Pope Leo XIV.
Photographers captured another round of striking images of the king and queen during a moment of public prayer beneath the Michelangelo ceiling.
Author's summary: King Charles meets with Ukraine's President.