KYIV, Ukraine — U.S. Secretary of State Antony Blinken arrived Tuesday in Kyiv on an unannounced visit to assure Ukraine of continued American support and the flow of much-needed weapons as Russia presses on with its new offensive in the northeastern Kharkiv region.

Blinken arrived by overnight train from Poland and was due to meet with Ukrainian President Volodymyr Zelensky in his fourth visit to Kyiv since the start of the Russian invasion in February 2022, according to an AFP journalist accompanying him.