South Korea's newly-elected President Lee Jae-myung and Japanese Prime Minister Shigeru Ishiba agreed during a telephone call to strengthen bilateral ties, a South Korean presidential spokesperson and Japan's foreign ministry said on Monday.

Left-leaning challenger Lee Jae-myung won South Korea’s presidential election, ending three years of conservative rule in a race that was largely a verdict on his ousted predecessor’s botched attempt to revive martial law in the longstanding US ally.