NUSA DUA, Indonesia (AFP) - Indonesian President Susilo Bambang Yudhoyono on Wednesday warned of new strategic rivalries as the world deals with complex challenges including terrorism and religious conflict. The ex-general made the comments in a speech opening the 16th Ministerial Conference of the Non-Aligned Movement. "We must encourage the major powers to maintain stable and cooperative relations. We must help to ensure that the seismic power-shifts do not lead to new strategic tension," Yudhoyono told the assembled foreign ministers. "Where possible, we should encourage a constructive process of cooperative security so that enemies become friends, and friends become partners."