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US president Barack Obama and other major heads of government could be dining out at Cardiff Castle, the Royal Welsh College of Music and Drama or even on a Navy destroyer during the first evening of the Nato Wales Summit, organisers have revealed.

Three sites in Cardiff will host working dinners for the heads of state and government, foreign ministers and defence ministers of the 28-nation military alliance on September 4, a joint statement from the Welsh Government and the Wales Office said.

As well as Cardiff Castle and the Royal Welsh College, the third venue is the Royal Navy type 45 destroyer, HMS Duncan, which will be docked at Cardiff Bay during the summit at the Celtic Manor Resort in Newport.

But, for what are understood to be security reasons, it hasn’t been made clear which dinner will be taking place where. Organisers promise that Welsh food and drink will be served at the working dinners.

There was also no specific information yesterday on what disruption these events will cause – although the Welsh Government and the Wales Office said both governments had worked with Gwent and South Wales Police to keep this to a minimum.

Police previously said any impact of the summit will be focused around Cardiff city centre, the Celtic Manor Resort and the roads in between, particularly the M4 – with rush hour on September 4 noted as one of the most affected times.

Meanwhile Newport’s Tredegar House, which is run by the National Trust, will host a reception for hundreds of members of the international media due to cover the meeting.

Secretary of state for Wales Stephen Crabb said: “Not only will the Nato summit in Newport be the largest gathering of international leaders ever to take place in Britain, it is also an unprecedented opportunity to showcase Wales on a global stage.”

First Minister Carwyn Jones said: “I am delighted that some of the most striking buildings in both Newport and Cardiff will be used to showcase the best of Welsh hospitality during the Nato summit.”

A Cardiff Council spokesman said: “This event will allow Cardiff to be showcased to the rest of the world.”

Hilary Boulding, principal of the college, said it was honoured to invite one of the working dinners, adding: “It is now recognised as a major landmark in our capital city, and we look forward to playing our part in one of the most prestigious events ever held in Wales.”

Jo Cartwright, National Trust general manager at Tredegar House said: “I’m sure an evening at Tredegar House will leave a lasting impression with all attending.”