These increasingly international cities develop twinning networks and projects, share information, sign cooperation agreements, contribute to the drafting of national and international policies, provide development aid, promote assistance to refugees, and do territorial marketing through decentralized city-city or district-district cooperation. Cities do what “municipalities” used to do many centuries ago: they cooperate but also enter into intense competitive dynamics. To understand current sociopolitical dynamics on a planetary level, we need to have two mental maps in mind: the state-centered map and the nonstate centered map. We must take into account the existence of a complex diplomatic regime based on different overlapping levels—the urban and the state.