And that would be a bad thing?

BBC NEWS | Middle East | Syria warns over UN peacekeepers

From the link:

Syria has reportedly threatened to close its border with Lebanon if UN peacekeepers are deployed there.

Finland's foreign minister made the claim after meeting his Syrian counterpart in Helsinki.

"They will close their borders for all traffic in the event that UN troops are deployed..." Erkki Tuomioja said.

Earlier, the Syrian president, Bashar Assad, said the stationing of UN troops in the border area of Lebanon would be a hostile move against Syria.

"This is an infringement on Lebanese sovereignty and a hostile position," President Bashar Assad told Arab TV.