BEIRUT, Lebanon — High-level diplomatic efforts to stop the fighting in Syria yielded mixed results on Saturday as President Bashar al-Assad shut the door on any immediate negotiations with the opposition and escalated a new military assault on the city of Idlib.

Mr. Assad told the United Nations envoy Kofi Annan that such talks would be fruitless as long as “terrorist groups” were operating in the country.

“No political dialogue or political activity can succeed while there are armed terrorist groups operating and spreading chaos and instability,” the state news agency, SANA, quoted Mr. Assad as saying.

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