The phrase "diplomatic weight" is correct and can be used in written English.
It refers to the importance or influence that a country or individual has in diplomatic relations. Example: "The United States' diplomatic weight was crucial in brokering a peace agreement between the two warring nations."
It may even increase Prime Minister Tony Blair's diplomatic weight in Europe.
The UK should put its full diplomatic weight behind the new political talks – the Vienna process.
Such statements do not carry the diplomatic weight of a Security Council resolution.
It permitted peace negotiations under the auspices of the Organisation of American States, but put no diplomatic weight behind them.
If ever there was a case that begged for the use of America's full diplomatic weight to drive home a solution, this is it.
With the diplomatic weight of our government and coverage by our media, this moral and humanitarian crisis can be brought to an end.
The damage-limitation exercise reflected concerns that Jackson's comments could carry considerably more diplomatic and political weight than recent similar criticisms.
We must use our considerably diplomatic and economic weight to bring about change," she told an event organised by the Palestinian Solidarity Campaign at Labour's party conference.
Hailemariam Desalegn, Ethiopia's prime minister, and Uhuru Kenyatta, Kenya's president, flew to Juba on December 26th but were put in the shade by Yoweri Museveni, Uganda's president, who threw his diplomatic and military weight wholesale behind Mr Kiir.
Because of its strategic position and mixed community, Luxembourg has a way of punching above its weight in diplomatic affairs.
"It's the type of fight that you need to send the full support and weight of diplomatic, political and social help".
