The phrase "a diplomatic role" is correct and usable in written English.
It can be used when referring to a position or function that involves managing relationships and negotiations between countries or organizations.
Example: "As the ambassador, she was tasked with a diplomatic role that required her to navigate complex international relations."
Alternatives: "a diplomatic position" or "a diplomatic function".
It's very much a diplomatic role.
Russia still hopes to play a diplomatic role with Assad, a long-term ally and customer of Moscow's arms exports.
Clinton visited to negotiate for their release, in a diplomatic role similar to the one former president Jimmy Carter played previously.
It also has a diplomatic role of encouraging people to trust you and your colleagues, to follow your safety advice and to allow you into their homes.
But the United States also has a diplomatic role to play in helping reintegrate Iraq into regional and international forums while discouraging neighbors, most notably Iran, from meddling.
Geoff Morrell, the Pentagon press secretary, said that Mr. Gates would be playing "more of a diplomatic role" on the trip compared with his usual talks here focused on national security and defense.
Even if it is just a bluff, his pivot toward Russia — which itself seeks a larger diplomatic role in the Middle East — adds one more element to a list of shifts under way in the region.
Given the mocking account of treaties in Utopia (CU: 197 201), it is unlikely that he was over-optimistic about their lasting effect, but he played a significant diplomatic role in the 1520s, participating in a number of important negotiations.
"[It] desires that Pakistan should maintain neutrality in the Yemen conflict so as to be able to play a proactive diplomatic role to end the crisis". Saudi Arabia has been a major foreign donor to Pakistan - some say perhaps the third-largest after the US and China.
While a host of nations and international organizations have condemned the violence, China could play a unique diplomatic role.
He also played a major diplomatic role in the attempt to reconcile the Greek and Latin churches.
