South Korean President Yoon Suk-yeol said Saturday his country will provide a bigger batch of military supplies and humanitarian aid to Ukraine during a visit to Kyiv for a meeting with President Volodymyr Zelenskyy.

The surprise trip came after Yoon attended a NATO alliance summit in Lithuania and visited Poland this week, where he expressed solidarity with Ukraine against Russia's invasion.

South Korea is a U.S. ally and the world's ninth biggest arms exporter, according to the Stockholm International Peace Research Institute (SIPRI) think tank. But it is also wary of Russia's influence over North Korea and has been resisting Western pressure to help arm Ukraine directly.