The Russian foreign minister, British foreign secretary and US secretary of state are among the 50 foreign ministers expected to attend a major meeting in Dublin next week.
Delegates numbering 1,500 from 70 countries will also attend the ministerial council of the Organisation for Security and Co-operation in Europe (OSCE), which Ireland currently chairs.
It will be the biggest meeting of foreign ministers ever held in Ireland and will involve road closures and traffic restrictions around the RDS Simmonscourt where it will take place between December 6th and 7th.
The cost of the meeting was expected to be €2.4 million, not including security costs, with the overall spend on chairing the OSCE put at €6 million, according to Brian Glynn, director of the OSCE at the Department of Foreign Affairs. A study by the Dublin Chamber of Commerce put the value of hosting the meeting at €2.35 million, he added.
Gardaí said Shrewsbury Road and Simmonscourt Road will be closed during December 6th and 7th.