according to the charter of the sco, summits of the council of heads of state shall be held annually at alternating venues. the locations of these summits follow the alphabetical order of the member state's name in russian. the charter also dictates that the council of heads of government (that is, the prime ministers) shall meet annually in a place decided upon by the council members. the council of foreign ministers is supposed to hold a summit one month before the annual summit of heads of state. extraordinary meetings of the council of foreign ministers can be called by any two member states.