Assad threatened to attack the region held by US -backed Kurdish fighters in northeastern Syria if talks fail to bring the area back under Damascus' authority.
The SDF, which Assad dubbed the "only problem left in Syria", would be confronted with force if negotiations fail, the president said.
If that does not work, Assad said he would "resort to liberating those areas by force".
Russian Federation said on Monday that only Syrian army troops should be at the southern border with Jordan and Israel, which has waged air strikes in Syria to curb what it fears is Iran's expanding influence.
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After the advance of the Syrian army, as well as the unreliable nature of opposition forces, the United States administration has started losing its "cards" and could be brought to the negotiation table, Assad said. If we abandon the Kurds we will look like very unreliable allies and will be effectively stabbing them in the back after they were one of our most dependable and fierce partners in the war against ISIS.
Iran has pledged that it would punish Israel for the deadly air raid.
On April 14, the US, Britain and France launched a coordinated missile attack against sites and research facilities near Damascus and Homs with the purported goal of paralyzing the Syrian government's capability to produce chemicals.
Responding to U.S. President Donald Trump's description of him as "Animal Assad", the Syrian leader said: "What you say is what you are".
The Syrian military is preparing to attack rebel groups in Daraa and Quneitra, and the prospect of Iranian or Hezbollah fighters near the border alarmed both Israel and Jordan, according to reports in Israel Hayom.
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Reports from pro-government sources in Syria late Wednesday suggested a Syrian government offensive to recapture territory in the south was just days from kicking off.
The Syrian regime's survival, largely due to Russian intervention, placed Vladimir Putin directly at odds with Israeli Prime Minister Benjamin Netanyahu. "So we are supporting any global mechanism that could limit the influence of Iran in the region in general, and in our country in particular", he added.
The attack triggered U.S., French and British missile strikes against what they called chemical weapons targets, the first co-ordinated Western strikes against Assad's government of the war.
The SDF wants a "democratic system based on diversity, equality, freedom and justice" for all the country's ethnic and religious groups, he added in a voice message to Reuters. "It represents him, and I think there is a well-known principle, that what you say is what you are". Israel is satisfied with Russia's position on Iran's military presence in Syria, Israeli Ambassador to Moscow Gary Koren said in an interview with TASS.
With military backing from Russian Federation and Iran, he has reclaimed most of the territory lost to rebels in the wake of the popular uprising that swept the country in 2011 and quickly descended into all-out civil war.
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