June 19, 2017 10:33 a.m. ET
MOSCOW—Russia escalated tensions with the United States Monday, promising to actively track U.S. and coalition aircraft over Syria with air defense systems and warplanes, the country’s defense ministry said.
In a statement released Monday, the Russian military said it would treat U.S. and coalition operating west of the Euphrates Rivers as “aerial targets,” but stopped short of threatening a shootdown.
“In regions where the…
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