World powers Friday agreed an ambitious plan to cease hostilities in war-racked Syria, but the Munich deal left out the Islamic State group and Al-Qaeda’s local branch, leaving analysts to doubt its viability, reports AFP from Munich. The 17 countries agreed “to implement a nationwide cessation of hostilities to begin in a target of one week’s time,” said US Secretary of State John Kerry after extended talks co-hosted by Russian Foreign Minister Sergei Lavrov. The International Syria Support Group also agreed that “sustained delivery” of aid will begin this week, with a new UN task force meeting later Friday in Geneva to start pushing for much greater access to “besieged and hard-to-reach areas”. The deal went further than expected, with Lavrov talking about “direct contacts between the Russian and US military” on the ground. But Kerry said they were under “no illusions” about the difficulty of implementing the agreement. Analysts were sceptical the deal would stop the bloodshed. “It is ambitious and yet very tenuous... there are huge question marks,” said Julien Barnes-Dacey, of the European Council on Foreign Relations.