The Syrian army is in full control of the highway from Damascus to ancient Palmyra for the first time since 2014 after driving out jihadists, a monitor said today.
Since troops recaptured Palmyra from the Islamic State group in March, the UNESCO World Heritage site had been accessible via Syria's third city Homs, about 150 kilometres (95 miles) to the west.
But after major advances on Thursday night, the army now controls the direct road from the capital to Palmyra, the Syrian Observatory for Human Rights said.
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"The jihadists were withdrawing because of how intense the Russian air strikes were," Abdel Rahman said.
Palmyra's temples, colonnaded alleys and elaborately decorated tombs - some of the best preserved classical monuments in the Middle East - attracted more than 150,000 tourists a year before civil war broke out in Syria in 2011.
IS fighters first overran it in May 2015, and government troops recaptured it 10 months later.
The jihadist group retook it in late 2016, but Russian- backed Syrian forces wrested back control in March.
A decades-old ally of Damascus, Moscow has been carrying out air strikes in support of President Bashar al-Assad's troops since September 2015.
The Syrian army appears to be conducting a multi-pronged drive towards the oil-rich territory near the country's eastern borders with Iraq and Jordan.
But parts of the frontier are controlled by rebel groups backed by the US-led coalition fighting IS.
Earlier this month, coalition warplanes struck a convoy of pro-government forces headed towards a remote coalition garrison near the Syrian-Jordanian border.
The desert, known as the "Badiya," extends over some 90,000 square kilometres (35,000 square miles) and makes up about half of Syria's territory.
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