Russian, Israeli and Western sources believe that there are no alternatives to protecting Israel without Al-Assad because he alone can guarantee there will be no attempt to retake the Golan Heights or liberate the occupied territories.
As a result, Free Syrian Army (FSA) fighters and their families are expected to head to the northern province of Idlib and a small area under rebel control near the Golan Heights.
So now after the Nasib crossing is back under the government's control, expectations are high that both governments could work to reopen it on both sides despite the fact that the Syrian government blames Amman for supporting the ultra-radical rebels in Daraa during the seven-year-long war in Syria.
Recapturing it could bring renewed trade with neighbouring Jordan.
Most of the refugees are women and children from the Daraa province who traveled on foot all the way west to Israel or south to Jordan. The Syrian flag flew in the distance, along with what appeared to be a Russian flag.
They said Russian Federation had insisted opposition factions hand over their heavy weapons in one go, while rebels wanted to do so in several phases.
"Lieberman gave the green light to Al-Assad to attack Deraa" in southern Syria, Al-Walie said.
In a statement, the Israeli army added that the mortar shell which fell east of the border fence was "part of the internal fighting between the regime and opposition factions in Syria".
He said Syrian and Russian jets had pummeled towns across the southwest and villages near the border crossing.
Most of the hospitals had shut down amid the destruction in insurgent territory, which now barely had access to water or electricity, he said.
Hundreds of troops in a large military convoy with Russian and Syrian flags advanced on Syria's Nassib border crossing with Jordan, witnesses said.
"As for the notion that Assad will push Iran out after achieving victory, the return of his forces to the south means just the opposite", Ghaddar and Smyth wrote.
Kurdish sources said Islamic State militants were behind the blast.
Similarly, Israel is quietly acknowledging that Assad's forces will soon be on its doorstep, laying down red lines for postwar relations with the Syrian leader.
Rebels who did not wish to come back under President Bashar al-Assad's rule would leave for the insurgent stronghold in north-west Syria, they said.
"Along with explosive residues, various chlorinated organic chemicals were found in samples from two sites", it said, indicating that chlorine may have been used as a weapon.
It was unusual for an Israeli official to say such things about the Iranian presence in Syria, and many suspected Russian Federation was acting in coordination with Israel and with the backing of the US.