"US media in a panic: Russian S-400 air defense systems arrived on Cuba’s “island of freedom”. Moreover, this was done so unexpectedly that before that the information in the press did not slip."
https://www.veteranstoday.com/2020/02/04/breaking-trump-lied-to-us-russia-put-s-400-in-cuba-hypersonic-nuke-missiles-coming-soon-again/
58 Years Since Cuban Crises Now Russia Deploys S-400 in Cuba
"The S-400 Triumf is a mobile, surface-to-air missile system (SAM) designed by Russia. It is capable of engaging aircraft, UAVs, cruise missiles, and has a terminal ballistic missile defense capability. It represents the fourth generation of long-range Russian SAMs, and the successor to S-200 and S-300. The longest reach for the S-400 is 400 km with speeds of around Mach 14, giving the jet fighters little time to respond.
Now, given this defense system, unique capabilities would a theoretical S-400 deployment to Cuba pose a credible threat to the U.S. air assets based on the country’s east coast?"
https://fighterjetsworld.com/weekly-article/what-would-usa-do-if-russia-had-s-400-missile-system-in-cuba/20076/