The past two weeks have produced a remarkable sequence of high-profile diplomacy — from the BRICS summit in New Delhi to the UN General Assembly in New York and, finally, Chinese President Xi Jinping’s state visit to Washington.Taken together, the meetings point to a shift in how global power is being organised. India’s relationships with Washington, Moscow and Beijing, China’s partnership with Russia alongside its engagement with the United States, and Washington’s simultaneous competition with Beijing and renewed diplomacy with Moscow all show the same pattern.The major powers are increasingly operating through overlapping relationships: rivals on one issue, negotiating partners…