Russian military aid to Syria: Burning questions and answers

Two systems. One, the S-300, is an advanced version of the air-defense system originally designed in the Soviet Union in the 1970s and further developed in the 1990s. The S-300 has several advantages over the older Soviet-era anti-air batteries Syria already uses. First, the range of its radar and missiles allows it to hit targets at ranges of up to 200 kilometers.

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