CAIRO (Reuters) - Leaders of 16 developing countries began a day of rest, relaxation and private talk in a Sinai resort away from media glare on Tuesday, officials said. President Hosni Mubarak welcomed his guests, in Egypt for a G15 summit meeting, to a seaside hotel after they arrived at Sharm el-Sheikh airport to a welcome of singing and dancing by a bedouin troupe. Mubarak planned to take his fellow heads of state or government on a tour of the resort town and host a lunch. The leaders were also due to hold talks without their delegations. The G15 summit, which opened on Monday, has focused on how emerging economies can avoid the financial storms sweeping southeast Asia since July and get a fair deal in world trade. But India's startling announcement that it had carried out three underground nuclear tests on Monday was dominating talk among delegates, although many reserved immediate comment. Egyptian Foreign Minister Amr Moussa told Reuters that in principle Egypt wanted the nuclear Non-Proliferation Treaty to be fully applied to promote disarmament and nuclear-free zones. "I will make a comment about this later," Malaysian Prime Minister Mahathir Mohamed told reporters on Monday night. His foreign minister, Abdullah Ahmed Badawi, said later the G15 had not discussed the explosions. The Indian delegation, led by Minister of State for External Affairs Vasundhra Raje, ducked questions on the significance of the tests. Algerian Foreign Minister Ahmed Attaf whistled in surprise at the news and chattered urgently with his colleagues, but refused to comment. Badawi said the economic difficulties of countries such as Indonesia and Malaysia had loomed large at Monday's session. Egyptian presidential adviser Osama el-Baz told reporters the session had underlined the concerns of many G15 members that they were being bypassed in world trade. "More than one head of state said major industrial countries ignore the necessary balance in the world order. This leads to unfair trade structures and obstacles to development," Baz said. "There is a general trend that the way globalisation is carried out so far is unbalanced. It favours major industrial countries at the expense of the developing ones." The G15 is trying to adopt a common approach ahead of this week's World Trade Organisation ministerial talks in Geneva. The G15 includes Algeria, Argentina, Brazil, Chile, Egypt, India, Indonesia, Jamaica, Malaysia, Mexico, Nigeria, Peru, Senegal, Venezuela, Zimbabwe and newcomer Kenya. Sri Lanka's application for membership was approved at the G15 summit and one from Colombia was being considered.