Several major Syrian rebel factions vowed Monday to retaliate against government forces for alleged violations of the cessation of hostilities, in a further sign that the war-torn country's ceasefire is teetering.
Most frontlines in the Yemeni civil war were reported to be calm after a ceasefire between mainly Shiite rebels and a Saudi-led coalition backing their local rivals came into effect at midnight (2100 GMT).
A truce, scheduled to go into effect in Yemen at midnight Sunday, is "a moment of truth" for the nation where thousands are displaced daily in fighting, humanitarian groups said Sunday in a joint statement.
Armenia and Azerbaijan agreed on Tuesday to an immediate ceasefire after a recent surge of fighting in the disputed region of Nagorno-Karabakh, the TASS news agency reported, citing Armenia's Defence Ministry.
US Secretary of State John Kerry called Sunday for Syrian allies Russia and Iran to exert influence on the government of Bashar al-Assad to uphold a partial ceasefire that went into effect on February 27 and has since been holding, despite some breaches.
Foreign ministers from France, Germany and Britain were meeting in Paris on Friday to take stock of the week-old ceasefire in Syria and international efforts to deliver humanitarian aid to besieged areas of the country.
The ceasefire in Syria has greatly reduced the level of fighting and has made aid shipments possible, UN Syria mediator Staffan de Mistura said Thursday, expressing hope that this improves the prospects for next week's new peace talks.
Croatian Foreign Minister Miro Kovac said during a visit to Munich on Friday that he was satisfied that the International Syria Support Group (ISSG) had reached agreement on a cessation of hostilities in that country.