S-400 systems are a means of air defense.

Axar.az reports that Kremlin spokesman Dmitry Peskov said in response to a Greek journalist's question that "Greece is concerned about Turkey's S-400 air defense systems purchased from Russia."

"The weapons transported to Greece through the port of Dadaagac are not defensive weapons," Peskov said.

A Kremlin spokesman said Russia was concerned about the concentration of US and NATO troops in Greece and the transport of allied military equipment through the port of Dadaagac.

It should be noted that large-scale preparations are underway for the deployment of 120 NATO helicopters and 1,000 military equipment to the eastern border of the alliance - Greece, Bulgaria, and Romania, using the port of Dadaagaj.