https://www.theregister.co.uk/2019/07/01/japan_strangles_some_chip_exports_to_south_korea/

Just a day after the G20 free trade summit ended, Japan has restricted exports of some mobile phone components to South Korea.

Relations between the two countries have been less than cordial of late - a ruling by a South Korean court that Japanese companies should pay compensation for using forced labour during the Second World War has not helped. Japan insists that the issue was dealt with when diplomatic relations with South Korea were re-established in the 1960s.