Russia sends S-300 system to SyriaRussia sends the S-300 anti-missile system to its naval facility in the Syrian city of Tartus.
Syrian government offers rebels state passageAs Syrian government and allied forces advance toward Aleppo, rebels are offered state passage and aid supplies.
Ban orders inquiry into bombing of aid convoyUN Secretary-General announces a board of inquiry will investigate the bombing of an aid convoy in Syria.
UN aid chief: Aleppo facing a 'humanitarian catastrophe'United Nations aid chief warns that Aleppo faces a humanitarian catastrophe "unlike any" witnessed so far in Syria's brutal five-year war.
Kerry: We're 'on the brink' of ending talks with RussiaSecretary of State John Kerry warns that Washington is “on the brink” of ending its talks with Russia on the Syrian conflict.
Obama under fire for Syria policyUS President defends his refusal to use force in Syria, as diplomatic efforts fail and carnage continues with no end in sight.
Health workers, hospitals targeted in Syria warPattern of apparently deliberate targeting of hospitals and medical facilities emerges in Syria.
US threatens to end negotiations with Russia on SyriaAfter continued Russian attacks on Alleppo, US Secretary of State John Kerry warned that he would suspend talks on Syrian conflict.
Analysts: Russia looking to strong-arm USAs tensions between the two world powers escalate, experts say the Russians are 'going all out' in Aleppo to make US accept its demands.
Russia 'going all out' in SyriaRegime forces advance in battle for Aleppo after days of intensive bombing. Experts say Russia has given up on cooperating with US.
Battle of Aleppo: A war of wordsTrust between world powers collapses together with the short-lived reprieve from fighting, boding ill for civilians in the Syrian city.
The Battle of Aleppo, so farSyrian civil war battle in Aleppo has been called the biggest urban battle since Stalingrad in World War II. Here is the sequence of events.
Humanitarian aid delivered to besieged Syrian towns70 trucks of humanitarian aid delivered to four besieged towns in Syria for the first time in almost six months.
US, European allies say Russia must save Syria truceAs brutal fighting continues in Aleppo, US & allies press Russians to take 'extraordinary steps' to resuscitate dead ceasefire.
EU: Attacks in Aleppo a breach of international lawTop EU officials say attacks on civilians in the Syrian city of Aleppo amount to a "breach of international humanitarian law".
Lavrov: Syria ceasefire must be salvagedRussian Foreign Minister tell UN that agreements aimed at ending the war in Syria must be salvaged.
Syrian regime army begins assault on AleppoAir raids pound rebel-held area in shattered city as regime commences offensive operations with renewed vigor.
Syria meeting breaks up without plan to restore truceDiplomatic efforts to restore short-lived ceasefire are proving futile as intractable war rages on. 'Long, painful meeting.'
Syrian army launches new offensive on AleppoSyria's army announces an offensive to retake the rebel-held east of Aleppo, days after ceasefire fell apart.
Aleppo ablaze as resumed fighting intensifiesCeasefire a distant memory as heavy regime airstrikes hit rebel-controlled areas in battle of Aleppo. World powers cling to failed truce.
UN 'ready' to resume Syria aid convoysAfter a bombing of an aid convoy left 20 dead and suspended deliveries, UN says it is now ready to continue - if allowed to do so.
Kerry tells UN that Russia must ground Syria air forceStill hoping to revive failed cease-fire, US Secretary of State demands that Russia force the grounding of Syrian regime air force.
Russia to send flagship aircraft carrier to SyriaMoscow looks to bolster naval deployment off coast of Syria, as war appears to escalate after failed cease-fire.
UN Security Council holds crisis meeting on SyriaAs ceasefire falls apart and bombing rolls on, UN officials desperately cling to hope that truce can be reinstated.
United States concludes Russia attacked Syrian aid convoyOfficials say the United States has reached the preliminary conclusion that Russian warplanes bombed aid convoy in Aleppo.
Two more Turkish troops killed in Syria as war expandsTurkey becoming more heavily involved in Syria fighting as 2 more of its troops are killed by a landmine. Meanwhile, US and Russia meet.
Red Cross: Some 20 civilians killed in Syria aid convoy attackMore signs US-Russia brokered truce over, as airstrikes hit Red Crescent aid trucks, killing 20 and depriving many more of food & medicine.
Syria: 12 killed as aid convoy attacked18 trucks in a 31-vehicle convoy delivering aid attacked in Aleppo.
Assad: Airstrike on my troops is flagrant American aggressionSyrian President accuses US and its allies of supporting terrorist groups like ISIS after coalition airstrike kills 62 regime troops.
Syria accuses the United States of supporting ISISSyria's UN ambassador claims the United States wants ceasefire to fail, after American air strike accidentally hits Syrian soldiers.
Syrian army bids to recover losses to ISISQuagmire in Syria: After deadly airstrike by US-led forces, Syrian troops in the area look to resume fight against ISIS.
Besieged Aleppo turns to dangerous 'alternative' fuels250,000 residents of Aleppo have been left without electricity due to protracted siege, so they produce makeshift fuel out of plastic.
U.S. apologizes after air strike hits Syrian armyPentagon admits coalition fighting ISIS may have struck Syrian military positions in Deir Ezzor.
UN inquiry blames Syrian military for chlorine attacksUN inquiry identifies two Syrian Air Force helicopter squadrons and two other units in chlorine gas attacks, says Western diplomat.
U.S.: No cooperation with Russia until Syria aid flowsKerry tells Russian counterpart there will be no military coordination in Syria until regime forces there allow aid into besieged cities.
Human Rights group blames Turkey for civilian deathsHuman Rights Watch says Turkey was negligent in identifying target in Syria airstrikes, resulting in civilian deaths. Turkey denies charge.
Key rebel supporter Saudi Arabia welcomes Syria truceAmid concerns that Syrian rebel forces will not accept truce, key rebel backer Saudi Arabia welcomes it, but warns that regime must comply.
UN envoy lauds significant drop in Syria violenceUN's Syria envoy applauds a fall in violence through the first 24 hours of ceasefire, but says aid convoys have not yet deployed.
Death toll in Syrian war passes 300,000More than 300,000 people have been killed in Syria since March 2011, according to latest toll by the Syrian Observatory for Human Rights.
IDF attacks Syrian regime targets in the Golan HeightsAircraft from the Israel Air Force strike cannons belonging to the Syrian regime after mortar explodes in the Golan Heights.
'Last chance' ceasefire in Syria takes effectU.S.- and Russia-brokered ceasefire takes effect amid skepticism over how long it will hold.
Ceasefire in Syria due to begin at sundown, opposition waversCeasefire due to commence at sundown on Monday, but excludes ISIS and other jihadist groups. Breakdown of forces involved in truce inside.
Hardline Syrian rebel group rejects truceIslamist Ahrar al-Sham rejects truce in Syria brokered by the U.S. and Russia.
For US and Russia, war in Syria is mainly in the airThe 2 superpowers and former foes have found themselves on opposing sides of the Syrian civil war but have avoided direct clashes.
Death still raining from the air as Syria truce lagsAt least 58 dead, including 13 children, from airstrikes on Idlib, in which busy marketplace was hit. Truce only come into effect tomorrow.
Key points in US-Russia truce deal on SyriaHere are the main points of the plan devised by the US and Russia to try to end the fighting in the Syrian civil war.
Will Syrian civil war finally end?Can the war in Syria be nearing an end? President Assad accepts US-Russian joint plan of pathway to end the conflict, but opposition unsure.
Syrian regime denies using chlorine, blames 'terrorists'Syrian government denies it used chlorine gas in an attack in Aleppo, following which dozens were treated for breathing problems.
Top Syrian rebel commander killed in airstrikeLeader of Fateh al-Sham, formerly Al-Nusra Front, killed in an airstrike during a meeting of the group's leaders.
Syria regime retakes key Aleppo district from rebelsAssad forces retake strategic area as 'largest urban battle since World War 2' rages on, causing continued civilian suffering and privation.
Britain, Syrian opposition lay out plan for post-Assad SyriaBritish Foreign Minister Boris Johnson to meet Syrian opposition leaders to plan for gradual transition to democracy in Syria, sans Assad.
Syrian regime reportedly uses chlorine gas in AleppoDozens of people treated for breathing problems in Aleppo after regime helicopters drop barrel bombs which may have contained chlorine gas.
'War crimes are a hallmark of this bloody conflict'UN urges all parties involved in war in Syria to restore the collapsed cease-fire, accusing all sides in the conflict of war crimes.
Erdogan proposes Syria 'no-fly zone'Turkish President says he proposed to both the United States and Russia the setting up of a no-fly zone in northern Syria.
Syria regime advances south of Aleppo, threatens new siegeSyrian government forces advanced on Sunday south of Aleppo as they pushed to once again encircle rebel neighborhoods and reimpose a siege.
Rebels conquer massive swath of SyriaSyrian opposition fighters have seized several areas in a rapid advance against government forces in central Hama province.
Iran to Turkey: Get out of SyriaIran claims Turkey's offensive "a violation of Syria's sovereignty," as Turkey marches deeper into Kurdish-claimed territory.