North Korean leader Kim Jong Un is heading to Beijing by train on Tuesday to attend a military parade with his Chinese and Russian counterparts, North Korea’s state media reported. The event could demonstrate their potential three-way unity against the United States.

Kim and Russian President Vladimir Putin are among the 26 world leaders who’ll join Chinese President Xi Jinping to watch Wednesday’s massive military parade in Beijing that commemorates the 80th anniversary of the end of World War II and China’s fight against Japan’s wartime aggressions.

While the event would mark Kim’s first attendance of a major multilateral event during his 14-year rule, it would also be the first time for Kim, Xi and Putin, all key challengers of the U.S., to gather at the same venue. None of the leaders have confirmed a private trilateral meeting.

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