Earlier reports said that the Israelis want the withdraw of Iranian forces from southern Syria to accept the agreement, which will see the return of the Syrian army to the rebel-held areas in Daraa, near Jordan, and Qunaitera, on the border with the Israeli-occupied Golan Heights.
It's a prized region for almost all stakeholders in Syria's war due to its strategic geographical position: the south borders Jordan and the Israeli-occupied Golan Heights, but also lies close to Damascus.
The United States has also warned the government it would take "firm and appropriate measures" in response to any violations of the southwest de-escalation zone.
Damascus, Jun 15 (Prensa Latina) President Bashar Al-Assad carried out today the Eid al-Fitr prayer, a Muslim holiday that announces the end of the holy fasting month of Ramadan, in the Khadijah mosque, in the coastal province of Tartus (northwest).
Since a year ago, a "de-escalation" deal brokered by Russian Federation, the United States and Jordan has contained fighting there.
He said that there was a chance for reconciliation, but the "Americans and Israelis prevented it".
"Contacts are still ongoing between the Russians, the Americans and the Israelis", Assad said.
"If that doesn't succeed, we have no other option but to liberate it by force".
But Assad made it clear that the presence of the Iranian military experts and forces are not for negotiation.
In an effort to hide their support to Daesh and other terror groups in Syria the U.S. and Israelhas called for Iranian advisors and Hezbollah's fighters to leave Syria.
"Hizballah is a basic element in this war - the battle is long, and the need for these military forces will continue for a long time".
"Our position as a state has been from the beginning to support any act of resistance, whether against terrorists or against occupying forces, regardless of their nationality". The Islamic State group has a limited presence in the region.