Turkey and Russia have agreed upon a ceasefire plan for all of Syria that should come into force at midnight, the state-run Anadolu news agency said today.<br/><br/>The plan aims to expand a ceasefire in the city of Aleppo, brokered by Turkey and Russia earlier this month to enable the evacuation of civilians, it said. If successful, the plan will form the basis of upcoming political negotiations between the regime and opposition overseen by Russia and Turkey in the Kazakh capital Astana, it added.<br/><br/>Ankara and Moscow have been on opposing sides in the Syrian civil war, but the two countries have started in the last few months to cooperate more tightly on Syria. They have also been able to strike a deal to normalize ties strained by Turkey's shooting down of a Russian warplane last year. The Saudi-backed opposition group said it knew nothing of the negotiations but supported a ceasefire.