Russians caution U.S.

MOSCOW» A stern Russian warning Thursday against targeting its special forces in eastern Syria heightened concerns over direct clashes between rival Moscow- and Washington-backed forces fighting for the energy wealth to be found among the Islamic State’s shrinking domain.

The warning was followed by an acknowledgement from the Pentagon of an unprecedented, face-to-face meeting between Russian and American military leaders inside or near Syria to address the rising tensions.

With both Russian-supported Syrian government forces and rival, U.S.-supported Syrian Democratic Forces determined to follow the bends of the Euphrates River all the way to the Iraqi border, Russia’s warning underscored the delicacy of the arrangements that have so far kept the two sides from entering into open conflict.

Both sides and their patrons say they are determined to wipe out the Islamic State from Raqqa province in the north and Deir El-Zour province in the east as quickly as possible. The Syrian government depends on Iranian military support, as well.

But the region — especially Deir el-Zour province — is home to mineral, natural gas and oil reserves that the Syrian government will need to restore its economy as it looks to wind down a more than six-year-long civil war.

As for the SDF forces fighting there, most are from the province and many do not want Syrian President Bashar Assad’s authority restored, having risen up against his government in the early years of the war.

And Washington fears that further advances by pro-government forces could help Iran — which also has thousands of militiamen fighting alongside the Syrian government — expand its influence across the region via a land bridge spanning through Iraq, Syria and Lebanon, all the way to Israel.

Russia’s Defense Ministry said for the first time Thursday that it had deployed special forces with pro-government forces in the province and accused the U.S.-backed SDF of firing on its allies twice in two days.

It said it would retaliate against any future strikes from SDF-controlled areas.

“The firing positions in those areas will be immediately destroyed with all the arsenal at our disposal,” said Ministry spokesman Maj. Gen. Igor Konashenkov in a statement.

Such a response would likely endanger the U.S. special forces embedded with the SDF, raising the possibility of escalation.

The U.S. provides artillery and air support for the SDF.