exact meaning?

[Arash]

could you sir please tell me the exact meaning?

in diplomatic circles,

[Snowcake]

Where diplomats are keeping to themselves... A circle is a group of people sharing an interest, activity, or achievement.

As in:

business circles
financial circles
commercial circles
society circles

Snowcake

[Anglika]

Not quite so restrictive as "keeping to themselves" - it is usually used to mean that something occurs in the world of diplomacy.

It does help to have your source sentence for a phrase like this which can have several interpretations

[Arash]

i realy appreciated the way you have explained dear Anglika.