Japan 's foreign minister warned India on Saturday against conducting any new nuclear tests, saying such a move would force a halt to any civilian nuclear cooperation between the two countries. The warning came a day after India 's cabinet approved a long-delayed draft law that will clear the way for foreign nuclear groups to build reactors in the 150-billion-dollar Indian atomic energy market. Before leaving for his two-day visit to India , Japanese Foreign Minister Katsuya Okada said any civilian nuclear deal between the two countries needed a clause to define how Tokyo would respond to any nuclear test by New Delhi.