Excuse me. I don't want to derail your chat, but can I interrupt for just a moment?

Hi! Excuse me. May I interrupt a moment? I'm Va'ru from the plains. How about you?
(This can be accompanied with the “I See you” hand gesture in the appropriate context and atmosphere. The gesture increases the level of formality.)

He interrupted the meeting.
(It does not necessarily have a negative connotation even though it evolved from a compound containing the component kxu, which in other contexts is clearly 'harm.')