Germany's Sigmar Gabriel also said Hariri should return as his departure has shaken Lebanon. An official visit to Saudi Arabia by such a senior figure marks a rare act of religious openness for Riyadh, which hosts the holiest sites in Islam and bans the practice of other religions, but says it wants to open up more to the world.
A It began when Lebanese Prime Minister Saad al-Hariri unexpectedly resigned on Nov 4, saying in a televised speech from Saudi Arabia that he feared assassination and accusing Iran and the Hizbollah militant group of destabilising the country and the region.
Mr Ibrahim Kanaan, a lawmaker from the Free Patriotic Movement - a rival of Mr Hariri's Future group - in a Twitter post after the interview, said Mr Hariri's return was "key to all political options and constitutional solutions". It has accused Lebanon of declaring war on it because of Hezbollah, and has advised Saudi citizens to leave Lebanon.
The US, France and Britain have all expressed strong support for Lebanon's stability and sovereignty.
Mogherini also said that all political parties in Lebanon should work together.
Multiple air strikes kill 43 in Aleppo
Losing it would force IS to revert to an underground guerrilla organization with no urban base. Albu Kamal is the last significant Syrian town IS controls.
Israeli Prime Minister Benjamin Netanyahu said Hariri's resignation should serve as "a wake-up call to the worldwide community to take action against the Iranian aggression that is trying to turn Syria into a second Lebanon".
Aoun has been convening high level meetings with Lebanese politicians and diplomats since Hariri stepped down, and the visitors said the president believed that Hariri's comments showed such efforts were working.
Saudi Arabia denies that it coerced Hariri into resigning or has kept him from leaving. Mr Aoun had earlier refused to accept Mr Hariri's resignation unless he tendered it in person in Lebanon.
"We wish that all those who exert an influence in Lebanon allow all the political actors in this country to exercise fully their responsibilities", French Foreign Ministry spokesman Agnes Romatet-Espagne told reporters at a daily briefing. "Iran does not interfere in Lebanon's affairs".
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