The Russian announcement that they will supply the S-300 to Syria is a troubling development for Israel.
https://www.newsweek.com/tel-aviv-diary-what-next-israel-and-russia-opinion-1135127
https://www.kommersant.ru/doc/3745000
https://www.inopressa.ru/article/24Sep2018/wsj/sanctions.html
https://www.inopressa.ru/article/24Sep2018/wsj/grain.html
https://www.bbc.com/russian/features-45501763
https://www.gazeta.ru/politics/2018/09/24_a_11994883.shtml
https://www.gazeta.ru/politics/2018/09/24_a_11990461.shtml
http://www.rosbalt.ru/world/2018/09/24/1734016.html
https://www.rbc.ru/newspaper/2018/09/24/5ba40d969a7947294d9493de