The United States on Wednesday stepped up warnings to Russia over its Syria policy, saying Moscow was trying to challenge the U.S. presence in northeastern Syria by violating the terms of an agreement and was also helping escalate the conflict in the northwestern province of Idlib.
source https://www.cbc.ca/news/world/u-s-warning-russia-idlib-military-de-confliction-1.5453445?cmp=rss