What Could Turkey's Latest S-400 Missile Tests Mean?

Turkish President Recep Tayyip Erdogan confirmed that Turkey has started testing the Russian-made S-400 defence system, brushing aside US warnings of 'serious consequences.' But what exactly is the S-400 and why does Turkey want to make them operational as soon as possible?
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Видео What Could Turkey's Latest S-400 Missile Tests Mean? канала TRT World