Nato security 'new ground for UK,' says Gwent Police
28 May 2014 Last updated at 15:58 BST
The man in charge of policing the Nato summit has said the security operation will be a bigger challenge than the London 2012 Olympics.
Assistant Chief Constable Chris Armitt said the number of delegates, including President Obama, and protection they need was "unprecedented" in Britain.
His team has studied previous summits to prepare for the possible challenge of protestors.
There are 100 days to go until the summit at Celtic Manor in Newport.
Jordan Davies reports.