By Tim Kelly and Joyce Lee

TOKYO (Reuters) -Japanese Prime Minister Shigeru Ishiba and South Korean President Lee Jae Myung agreed on Saturday to closer security and economic ties ahead of Lee's planned summit with U.S. President Donald Trump on Monday.

On his first official visit to Japan since taking office in June, Lee met Ishiba at the premier's residence in Tokyo to discuss bilateral ties between the East Asia neighbours, including closer security coordination with the United States under a trilateral pact signed by their predecessors.

"As the strategic environment surrounding both our countries grows increasingly severe, the importance of our relations, as well as trilateral cooperation with the United States, continues to grow," Ishiba said in a joint announcement with Lee after

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