| http://www.w3.org/ns/prov#value | - The approval was a surprise to many military sales analysts who had forecast the sale any an S-400 export version to a foreign military would not occur until at least 2020, or after all of Russia's requirements for the S-400 system had been met because of China's practice of reverse engineering such systems and then selling a cheaper version to its customers thereby undercutting Russian export sal
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