"There are talks between the Russians on one side and opposition factions on the other, through local mediators", said the Syrian Observatory for Human Rights, a Britain-based war monitor.
The agreements for the eight towns were reached even as regime airstrikes pounded other opposition holdouts in Daraa.
Saturday's talks came on the heels of similar negotiations which took place Friday, in which the Russians tabled their conditions to halt a Russian-backed government offensive to capture rebel-held areas along the borders with Jordan and the Israeli-occupied Golan Heights.
Jasser Al Masri, 42, was quoted in the report as saying that a number of people were slightly injured by the flying shrapnel.
State television broadcast live images from Dael, showing residents holding up posters of President Bashar al-Assad and chanting slogans in support of the army.
Over 100 civilians have been killed and thousands displaced since the regime offensive began two weeks ago.
It would also allow the regime to reopen the Naseeb border crossing with Jordan and resume lucrative trade across the frontier.
But Mr Assad set his sights on regaining full control of the provinces after defeating rebels in the Eastern Ghouta region outside the capital Damascus in April.
"It's inadmissible", a negotiator in the rebel-held part of Daraa city told AFP.
Regime warplanes launched a new wave of strikes on rebel areas after the talks collapsed on Saturday, including in Bosra Al Sham near the Jordan border where the talks were held, the Observatory said, causing deaths, injuries and damage.
The Kremlin said Russian President Vladimir Putin and U.S. President Donald Trump will have a detailed discussion about Syria when they meet in July.
Guterres reminded parties that the area was part of a de-escalation agreement agreed between Jordan, Russia and the United States.
People flee violence in Daraa, southern Syria, in this June 28, 2018 photo provided by Nabaa Media, a Syrian opposition media outlet.
"We would be glad for every family to prepare a sealed bag for a Syrian child with small games and toys, drawing paper, crayons and non-melting candy, to give them a moment of sweet, innocent joy", Malka said.
In that same period, 96 pro-regime fighters and at least 59 rebels have lost their lives.
Air raids meanwhile intensified, said the monitor, the Syrian Observatory for Human Rights, as displaced people flocked to the border areas least likely to be hit, and the United Nations warned of a humanitarian catastrophe.
Airstrikes pounded rebel-held areas in southwestern Syria on Thursday, killing at least 17 civilians in an underground shelter and driving thousands from their homes, as scores of displaced people protested near the Israeli-occupied Golan Heights, demanding global protection.
Jordan's prime minister visited a key crossing with Syria on Sunday, inspecting aid deliveries by the Jordanian army to the tens of thousands of displaced Syrians gathering at the border Amman has kept sealed.