There has been progress on a plan to restore Syria's fraying ceasefire, but last details still need to be worked out among global powers, US Secretary of State John Kerry said Monday in Geneva.

"We are hopeful, but we are not yet there yet," he told reporters after meeting Saudi Foreign Minister Adel al-Jubeir and UN Syria peace mediator Staffan de Mistura.

Kerry held the Syrian Army responsible for attacks on hospitals and civilians amid the escalating violence in Aleppo city but made clear that "both sides - the opposition and the regime - have contributed to this chaos."

Russia and Iran, which support Syria's armed forces, must now make sure that the government of Syrian President Bashar al-Assad honours the truce, while the United States and other countries that back moderate rebels must do the same on the other side, Kerry said.

"We're trying to press this as fast as is possible," he said, expressing hope that the extent of progress would become clearer on Tuesday.

The US chief diplomat later spoke with Russian Foreign Minister Sergei Lavrov by phone Monday, Russian news agency TASS reported.

"Both ministers continued discussing the prospects for settlement and urged the parties to the conflict to observe ceasefire," a Russian Foreign Ministry statement said, according to the report.

De Mistura said he would hold talks Tuesday in Russia.

UN Secretary General Ban Ki-moon was "profoundly concerned" about the renewed fighting, calling on all sides to "recommit immediately" to the ceasefire and protect civilians, Stephane Dujarric, Ban's spokesman, said in New York.

"The collapse of the cessation of hostilities will only bring more violence, death and destruction, while further weakening efforts to find a negotiated solution to this brutal war," Dujarric said.

The recent surge in Syria's violence has scuttled a ceasefire that was brokered by Washington and Moscow and that went into effect in most parts of the country in late February.

De Mistura ended his latest round of peace consultations last week in Geneva, after opposition delegates halted their participation to protest the increased fighting and the regime's blocking of humanitarian aid.

Kerry said several plans for reviving the truce are on the table, but some details have yet to be agreed and the proposals still "need to be signed off by some people."

Saudi Arabia's al-Jubeir declared that the world would not stand by as Syrian President Bashar al-Assad and his foreign allies massacre civilians in Aleppo.

"The world is not going to allow them to get away with this," al-Jubeir said. "Bashar al-Assad's days are numbered."

Al-Jubeir warned that the Syrian president would have to resign or face a violent ouster.

Saudi Arabia has been one of the most important backers of the Syrian opposition, including armed groups, and hosts the main opposition bloc that has taken part in the Geneva peace talks.

The Syria government said Sunday it was extending a ceasefire in and around Damascus, while activists reported heavy fighting betweeb the regime and rebels in Aleppo.

The temporary ceasefire excludes Aleppo, where rebels fired shells Sunday on regime-held areas and unidentified helicopters dropped barrel bombs on rebel-controlled areas.

Latest news

Syrian opposition rules out future role for President al-Assad

The Syrian opposition said Friday it would not accept any role for President Bashar al-Assad in the future of the war-torn country, reacting to a recent US shift saying that removing al-Assad is no longer a priority for Washington.

Russian Army integrates breakaway forces of Georgian province

Parts of the small fighting forces of the Georgian breakaway province of South Ossetia have been placed under Russian military control, Russian Defence Minister Sergei Shoigu said on Friday.

Czech Republic's Pilsner Urquell beer is now Japanese

Japanese brewing company Asahi completed its takeover of the Czech brewery Pilsner Urquell on Friday, Asahi said in a statement.

Judge approves 25-million-dollar settlement of Trump University case

A US district judge on Friday approved a 25-million-dollar settlement of lawsuits and state fraud allegations against Trump University, the US president's now-defunct business venture.

Former Thai premier Thaksin to junta on reconciliation: 'Cut me out'

Former Thai prime minister Thaksin Shinawatra on Friday announced that he is not interested in the junta-led reconciliation process, three days after the junta handed him a half-a-billion-dollar tax bill for his past business deal.

Dalic: We welcome possible deal between Agrokor and banks

The government welcomes the possibility of an agreement being concluded between the Agrokor food company and creditor banks, and the bill on vitally important companies is not a fallback plan but the result of the government's care for the overall economic and financial stability of Croatia, Deputy Prime Minister and Minister of Economy Martina Dalic told a press conference in Zagreb on Friday.

Croatia, China sign action plan for cooperation in agriculture

The Croatian and Chinese ministries of agriculture on Friday signed an action plan for cooperation in the field of agriculture for the period 2017-2018, the Croatian ministry said in a statement.

ZSE indices up, Agrokor shares in focus of investor interest

The Zagreb Stock Exchange (ZSE) indices on Friday rose by more than 1.8%, with stocks of the Agrokor food and retail concern being in the focus of investor interest again.

Berlin police defend handling of Berlin market attacker

Berlin police defended themselves on Friday against accusations that they stopped surveillance on Berlin Christmas market attacker despite knowing in June 2016 he was dangerous.

Croatia, creditors tailor emergency measures to save tottering giant

Croatia's tottering retail and food giant Agrokor reached an agreement with its creditors, putting its debts standby and allowing it to continue working during emergency restructuring, the Croatian branch of Austria's Erste Bank said Friday.

Agrokor's creditors say standstill agreement to go into force today

A standstill agreement regarding the Agrokor concern's existing financial obligations to banks will take effect on Friday, additional capital will be injected into the concern in the coming days and the concern will be actively restructured, which includes a change of its management, it was said on Friday after a meeting between Agrokor's suppliers and creditor banks.

Palestinians, UN slam Israel's new settlement plan

Palestinians, Israeli activists and the UN lambasted the government of Israeli Prime Minister Benjamin Netanyahu on Friday, a day after it gave the go-ahead for the first new West Bank settlement in a quarter of a century.

South Sudan rebels release three abducted foreign oil workers

South Sudanese rebels have released three foreign engineers they abducted in early March in the oil-rich Upper Nile region, Foreign Affairs Ministry official Mawein Makol Arik said on Friday.

Turkish opposition: Imprisoned party chief has gone on hunger strike

The head of Turkey's pro-Kurdish opposition party has launched a hunger strike from prison.

European leagues threaten Champions League schedule clashes

The European Professional Football Leagues (EPFL) on Friday threatened schedule clashes on Champions League matchdays in an ongoing dispute with the governing body UEFA.

Danish court revokes citizenship of IS volunteer

A Danish appellate court on Friday stripped a man of his Danish citizenship for volunteering to fight for the extremist Islamic State in Syria.

Banks and Agrokor agree on key elements of standstill agreement

Member banks of the coordinating committee of financial creditors and representatives of the Agrokor food company have in principle agreed on key elements of a standstill agreement, which is expected to be signed later today, announcing changes in the company's management team, Erste Bank said in a statement on Friday afternoon.

Syrian man on trial in Sweden; mosque attack labelled terrorism

A Syrian man went on trial Friday in the southern Swedish city of Malmo, charged with terrorism and arson after an attack last year on a building used as an assembly hall by Shiite Muslims.