This is the 3392nd most frequent Russian word.
посте
The Russian word "посте" is not a standalone word; it may be a misspelling or incomplete form. If you meant "после," it means "after."
In this sentence, 'после' is used as a preposition to denote 'after' something, introducing the subsequent event.
Я пришёл домой после работы.
I came home after work.
Here, 'после' is used to indicate the sequence of events, suggesting the meeting occurred followed by the ambassadors' gathering.
Послы встретились после совещания.
The ambassadors met after the meeting.
In this context, 'после' refers to a condition following an event, emphasizing the change in the environment caused by the event.