oil-spot strategy
n.— «France’s Moroccan policies were skillfully guided by the flamboyant Resident General Hubert Lyautey, whose patient “oil-spot” strategy of conquest and “indirect” methods of governing both avoided a bloody and divisive conquest and preserved much of Morocco’s traditional political structure.» —“French Military Rule in Morocco: Colonialism and its Consequences” by Douglas Porch Middle East Journal Oct. 1, 2000. (source: Double-Tongued Dictionary)