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?
'Double Check’ is a weekly show double-checking various news stories from the week hosted by award-winning Turkish-Australian journalist Omer Kablan.
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