The phrase "a security ring" is correct and usable in written English.
It can be used to refer to a group or network of individuals or entities that work together to ensure security or protection, often in a specific context such as cybersecurity or physical security.
Example: "The company implemented a security ring to safeguard its sensitive data from potential breaches."
Alternatives: "security network" or "protection circle".
Violence flared when opposition activists tried to break through a security ring outside the building.
As rescuers searched for bodies, relatives of passengers pleaded with policemen who put a security ring around the airport outside Manama, the capital.
As well as placing cameras at all tunnels and bridges into Manhattan, the 36-page plan, called Operation Sentinel, calls for a security ring to be erected at Ground Zero and for a 50-mile buffer zone around the city within which mobile units would search for nuclear or "dirty" bombs.
Pakistani officials said Wednesday that their investigation into the sale of the nation's nuclear technology to Iran had now focused on Abdul Qadeer Khan, the father of Pakistan's atomic bomb, and that a "security ring" had been set up around his house five days ago to keep him from leaving the country.
A security "ring of steel" is already in place at keys sites in Cardiff and in Newport - some 12 miles (20km) of fencing with pedestrian access points.
Police said they had provided a security ring around the area, which has been relatively free of insurgent attacks.
It features a two-part plastic security ring that secures the lid, which can be unlocked with a secret code.
A seven-layer security ring will be in place around the area from where the US and Indian leaders will watch the parade, reports say.
At a crowded Lib Dem restaurant table outside the Birmingham conference's security ring, a veteran activist waved a forkful of calamari in the direction of a fellow councillor.
Or maybe a suicide bomber had breached the security ring around the base.
Venezuelan intelligence had secretly taped US Embassy contractors in Caracas talking in spook-speak: "That which took shape here is a disguised kind of intelligence… which is annexed to the third security ring, which is the invisible ring".
