The US fought Russian mercenaries in February, remember? Yevgeniy Prigozhin, *Putins chef*,
indicted for running the Internet Research Agency out of St. Petersburg that hacked the 2016 presidential elections, also played a role in a Feb. 7-8 attack on US forces in Syria:
A Russian oligarch believed to control the Russian mercenaries who attacked U.S. troops and their allies in Syria this month was in close touch with Kremlin and Syrian officials in the days and weeks before and after the assault, according to U.S. intelligence reports.
In intercepted communications in late January, the oligarch, Yevgeniy Prigozhin, told a senior Syrian official that he had secured permission from an unspecified Russian minister to move forward with a fast and strong initiative that would take place in early February.
snip
The recent incident took place on the night of Feb. 7-8, when a headquarters base of U.S. troops and their Syrian allies, located near a strategic oil field several miles east of the river and close to the town of Deir al-Zour, was attacked by 300 to 500 pro-regime forces.
The Americans quickly mobilized a ferocious response, including AC-130 gunships, jet warplanes and Apache attack helicopters. After three hours, the attacking force retreated, leaving behind what the U.S. military said was about 100 dead attackers. No casualties were reported among the Americans and their allies, the Syrian Democratic Forces (SDF).
More
https://www.washingtonpost.com/world/national-security/putin-ally-said-to-be-in-touch-with-kremlin-assad-before-his-mercenaries-attacked-us-troops/2018/02/22/f4ef050c-1781-11e8-8b08-027a6ccb38eb_story.html?utm_term=.9665d7e0b98d
(thanks, Eliot R!!)