MOSCOW (Reuters) - Saudi Arabia is working closely with Russia on uniting Syria's opposition, Saudi Foreign Minister Adel al-Jubeir said on Thursday, adding that Moscow and Riyadh agreed on the need to preserve Syria's territorial integrity and state institutions.

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Speaking at a news briefing after Saudi King Salman's meeting with Russian President Vladimir Putin in the Kremlin, Jubeir also said that both Russia and Saudi Arabia believe in the principle of non-interference in other countries' internal affairs and in the principle of territorial integrity.

(Reporting by Vladimir Soldatkin; Writing by Dmitry Solovyov; Editing by Christian Lowe)