China has been increasing its surveillance of Japanese nationals following Tokyo's decision to release treated radioactive water from the crippled Fukushima nuclear power plant, sources close to the matter said Sunday.Beijing has investigated the backgrounds of individuals involved in negotiations over the water discharge and a revised counterespionage law took effect in July, broadening the scope of what constitutes spying under Chinese law.Some political experts have said that the Communist Party may have tried to detain Japanese citizens living in China, with the leadership under Preside…READ FULL ARTICLE