Ethnic Armenians in Azerbaijan's breakaway region of Nagorno-Karabakh agreed to a Russian proposal for a ceasefire on Wednesday, 24 hours after Azerbaijan began an offensive to take control of the enclave that killed dozens and injured hundreds.
The separatist Armenian forces in Karabakh said Azerbaijan had broken through their lines and seized a number of strategic road junctions.
The self-styled "Republic of Artsakh" said that in such circumstances, it had no choice but to cease hostilities from 1:00 pm local time on Wednesday.
"The authorities of the Republic of Artsakh accept the proposal of the command of the Russian peacekeeping contingent to cease fire," it said.
"With the mediation of the command of the Russian peacekeeping contingent stationed in Nagorno-Karabakh, an agreement was reached on the complete cessation of hostilities from 13:00 on September 20."
Azerbaijan began its operation against Nagorno-Karabakh on Tuesday after some of its troops were killed in what Baku said were attacks from the mountainous region, which Azerbaijan had blockaded for nine months.
Nagorno-Karabakh is recognised internationally as part of Azerbaijan.
Russian ballistic missiles have killed 12 people and injured more than 30 in Kyiv early on Thursday, authorities said, damaging buildings and severing power supply to some parts of the Ukrainian capital.
South Korea and the United States will cut short annual joint military drills to five days from 11 and scale back some field training, the allies said on Wednesday, after President Donald Trump ordered a substantial reduction in US participation.
At least 100 people were killed when a low-tech artisanal gold mine collapsed in the Central African Republic on Tuesday, a senior official at a local mining association said.
An Israeli airstrike killed nine Palestinians at a police station in Gaza on Wednesday, medics said, two days after US envoy Jared Kushner ended a trip to the region that failed to push forward Donald Trump's plan to end the war in the enclave.