The leaders of France, Germany, the United States and the United Kingdom have issued the following joint statement on the attack which took place in Salisbury, UK.
If U.S. forces intervene in Syria and hit uniformed Russian military forces, the Kremlin is basically warning the United States that it will hit back and that there will be a war.
http://nationalinterest.org/blog/the-buzz/russia-sends-chilling-warning-america-over-syria-24908
https://politeka.net/blogs/616488-chto-nuzhno-dlya-mira/
http://www.globalaffairs.ru/redcol/Nazad-k-balansu-19421
https://nv.ua/opinion/yakovina/nakazat-putina-chto-predprimet-tereza-mej--2457896.html
https://ru.krymr.com/a/29101789.html
http://www.kasparov.ru/material.php?id=5AA9784E2F99D