This is stated in the message of the department.
The Department of Defense said that fifth-generation US fighters are “invisible” only to US taxpayers and overseas buyers. ”
“The thrill and excitement of the Pentagon over the probable desacralization of F-35 fighters by Turkish S-400 air defense systems are not unfounded,” the message said.
Also, the Russian Defense Ministry responded to a statement by the US Air Force commander in Europe and Africa, Jeffrey Lee Harrigyan, about the "plan" to overcome Kaliningrad air defense.