US has artificially created a quasi-state of terrorists in Syria and then fought it themselves.
Recurring pro-Kremlin disinformation about the US creating terrorists/Daesh in Syria. https://euvsdisinfo.eu/disinformation-cases/?text=Daesh&disinfo_issue=&date=
The US is fighting against Daesh together with the Global Coalition against Daesh http://theglobalcoalition.org/en/home/. The US MoD outlines the latest progress on their website https://www.defense.gov/News/Article/Article/1322158/strikes-continue-in-effort-to-defeat-isis-in-syria-iraq/. Furthermore, a recent report by the Conflict Armament Research has found that up to 90 per cent of weapons seized from ISIS in Iraq and Syria originated from China, Russia and Eastern Europe http://www.conflictarm.com/publications/. US arms accounted for just 1.8 per cent of items recovered between 2014 and 2017 while 43.5 per cent of weapons originated in China, according to analysts. http://www.dailymail.co.uk/news/article-5228199/Analysis-shows-origins-ISIS-weapons-came-from.html
Further debunking by the Myth Detector: http://www.mythdetector.ge/en/myth/russian-narrative-member-alliance-patriots-usa-allegedly-promotes-terrorism-pankisi-gorge