ocr: Since the 1950S,relations with North Korea have been the major Uncelll offoreign policy. These remain unresolved.North Korea has recently shown a new willingness to consider reunification, while simultaneously, South Korea suspects, pursuing an aggressive nuclear program. South Korea is also concerned that the North Korean economy may be about to suffer an East German-style collapse, which would seriously increase the social and economic costs oft union. Relations with China, once an important ally ofNorth Rorea, have improved anda are being cemented by trade.Japan: - is also a major trading p ...