pnitro4 said:
http://www.reuters.com/article/us-usa-trump-russia-safezones-idUSKBN15G41U
http://www.politico.com/story/2017/02/trump-syria-safe-zone-russia-react-234481
"Russian Foreign Minister Sergei Lavrov said on Wednesday that U.S. President Donald Trump should be more specific about his proposal to set up safe zones in Syria and said attempts to implement a similar policy in Libya had been tragic. ... Lavrov said he hoped Russia could discuss the issue with the U.S. State Department once it had drawn up more detailed plans for the safe zones. Lavrov said he did not think, from what he knew so far, that Trump was proposing to roll out safe zones in the same way as it had been done in Libya in 2011"
http://www.reuters.com/article/us-usa-trump-russia-safezones-idUSKBN15G41U
The 2011 Libyan "similar policy" that Lavrov is referring to, was a No-Fly-Zone that extended over the entirety of Libya, where America was at war with Gadhafi. Such an action in Syria would indeed be "tragic" as Lavrov suggested. If a No-Fly-Zone covers all or even a portion of Syria's airspace, and the Syrian Air Force is not allowed to enter its own airspace, or to fire into that airspace, then a state of war will exist between the United States and Syrian Republic. If Russia is also denied access to the airspace, America and Russia will also be in a state of war. If America destroys a Syrian aircraft without denying Russia access to the airspace, Russia and America may again find itself at war. A Syrian No-Fly-Zone is unenforceable, without war.
Lavrov is asking America to declare its intentions.