Russia's attack on U.S.-backed rebels in Syria puzzles, frustrates the Pentagon

One week after Russian aircraft bombed American-backed rebels in Syria, U.S. officials say they are still waiting for Russia to explain the incident that has put the two militaries at risk of confrontation. Russian aircraft on June 16 dropped cluster bombs on a New Syrian Army unit garrisoned at a base in al-Tanf, a remote desert outpost where the borders of Iraq, Syria and Jordan meet.

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