"establish a buffer zone" is a correct and commonly used phrase in written English.
It means to create a designated area of protection or space between two conflicting groups or areas. Example: The United Nations has called for both sides of the ongoing conflict to establish a buffer zone to prevent further casualties and promote peace.
Some critics had accused the Turkish government of wanting to establish a buffer zone in northern Syria to weaken the growing Kurdish autonomy in the region.
Calls for the international community to establish a buffer zone inside Syria might not yet have substantial international support, but the FSA's numbers are growing.
A more likely intention is to send the Islamists a message and establish a buffer zone along the Kenyan border that would be controlled by friendly Somali forces, including thousands of government troops trained in Kenya.
Kenyan troops moved into Somalia in October 2011 to try to establish a buffer zone between the country and Kenya following a spate of cross-border attacks by al-Shabaab.
BEIRUT, Lebanon, Aug. 2 — Hezbollah guerrillas fired the largest number of rockets yet into Israel — more than 200 — on Wednesday as thousands of Israeli troops faced fierce fighting in Lebanon, and sought to establish a buffer zone under their control.
AMMAN, Jordan — The United States and Jordan have stepped up training of Syrian opposition forces that may be used to establish a buffer zone along Syria's southern border, according to U.S. and Jordanian officials.
A United Nations UNN) peacekeeping force established a buffer zone between the two armies.
Establishing a buffer zone is very important for the sustainability of the PA.
Operation Free Sinjar aims to seize back the town, shutting off major Isis supply routes and establishing a buffer zone to protest its civilians from artillery fire.
The officials said the idea of establishing a buffer zone between Syria and Jordan — which would be enforced by Jordanian forces on the Syrian side of the border and supported politically and perhaps logistically by the United States — had been discussed.
That agreement established a "buffer zone" between Israeli and Syrian forces, occupied by a token contingent of United Nations peacekeepers a slim band of territory, about fifty miles long and never more than six and a half miles wide, adding up to about a hundred square miles in all.
