washington president barack obama meet friday national security team discuss fight islamic state war syria white house say reuters report meet obama advisers would consider military options syria syrian russian aircraft continue pummel city aleppo target u.s. officials say u.s. officials say consider unlikely obama would order u.s. air strike syrian government target stress might make decisions national security council meet readout meet release white house note unite state break bilateral talk russia reach ceasefire syria say obama direct team continue multilateral talk key nations seek diplomatic resolution civil war brief summary make mention u.s. options syria u.s. secretary state john kerry russian foreign minister sergei lavrov return syria talk saturday three weeks failure painstakingly draft ceasefire kerry pointedly avoid new bilateral negotiations lavrov invitation turkish saudi qatari iranian foreign minister join talk lausanne switzerland broaden discussion include powerful backers syria government rebel pressure rise halt ferocious three-week-old syrian government offensive capture rebel-held eastern zone aleppo unite nations say 275,000 civilians still live 8,000 rebel hold syrian russian iranian-backed force obama meet national security team syria islamic state