But at the same time they must be diplomatic when offering a different point of view.
Well, to be diplomatic about it, Moffett, 72, is already a legend in his own time.
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Financial industry players, such as Australia's Macquarie, are at the ready to participate, but the toughest hurdles may be diplomatic.
I'm always willing to be diplomatic, but I don't censor myself.
Fresh into his retirement, and less constrained by the need to be diplomatic, measured and uncontroversial on the spending of Holyrood's billions, the bark now comes with added bite.
Mr Cheney was certainly at pains to be diplomatic.
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"The recovery has been modest to be diplomatic, feeble at best, " says Martchev, who looks for the SOX to take out its July low once this rally peters out and short-sellers take new positions.
This does not mean that there should be no diplomatic contact with Tehran or that pressure should be exerted for the sake of it.
Success would be a diplomatic triumph for Lady Ashton, but it will be hard.
Some of their deference may be a diplomatic reluctance to rebuff Mr Bush to his face.
Qatar refused Iraqi demands to hand him over, saying such a move would be against diplomatic norms.
In Cairo, the president will also be feeling diplomatic pressure to show he is taking decisive action to restore order.
"We have to be very diplomatic and very clear that both sides are going to have to give, " Clinton told his guests.
Sending the fuel back, as Kansai Electric threatens, could be a diplomatic nightmare, as well as a legal and financial disaster for all concerned.
So what happens at Bali matters, though the declaration that comes out of it will be encrypted in diplomatic language, and the difference between success and failure will be imperceptible to the untrained eye.
It may be there's long-term diplomatic leverage to be had as well in discussions on the enlargements of Nato.
There can be no doubt that our diplomatic representatives abroad ought to be chosen with the utmost care and from the most pure and single-minded motives.
Prime Minister Manmohan Singh said the decision was unacceptable and that there would be consequences to diplomatic ties.
There may be lawsuits and diplomatic requests made and this takes plenty of time to deal with properly.
But perhaps only within the Obama Administration can a symbolic gesture by the IAEA be considered a diplomatic triumph.
Any plan to deport them on a large scale, as Malaysia has sometimes attempted, would be a delicate diplomatic issue.
Prime Minister Manmohan Singh said the decision was unacceptable and that there would be consequences to diplomatic ties unless the marines returned.
Since winning power, Mr Blair seems to have concluded that war is something in which Britain has a comparative advantage that can be turned to diplomatic advantage.
It may be that the diplomatic effect that the UK and France are hoping to exert in lifting the arms embargo is one upon the opposition rather than the Assad government.
Annan, however, warned against militarization, insisting that the issue has to be resolved through diplomatic channels and calling on governments in the region and beyond to work with Syrians.
But the nub of the transatlantic conflict over Iraq is a belief in much of Continental Europe that Saddam Hussein can be contained by diplomatic and economic measures, and that in any case replacing him is unlikely to improve matters.
He suggests that political and military espionage can be dealt with at the diplomatic level, which I have long supported, and that economic espionage should be approached in ways analogous to and derived from current frameworks for the regulation and protection of intellectual property rights.
Of course there must always be a flurry of diplomatic activity around the edges of reality.
And Mr Cameron's seeming disagreement with Mr Obama might actually be a form of diplomatic co-operation.
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