There have been disputes between Japan and Korea (both North and South) on numerous issues over the years. Korea was ruled by the Japanese government. (Korea under Japanese rule)South Korea refused to trade or open diplomatic relations with Japan until 1965, after which trade links expanded dramatically. Today, Japan and South Korea are major trading partners, and many students, tourists, entertainers, and business people travel between the two countries, whereas North Korea's political and economic relations with Japan are not developed. Japan does not recognize North Korea as a country.