“The first regimental set of the Russian-made advanced air-defense system known as the S-400 has arrived in China, a military-diplomatic source told Russia’s official news agency Tass this week. China became the first foreign buyer of the S-400 when it signed a contract in late 2014, and the first two ships carrying S-400 components from Russia arrived in China at the beginning of April.”
Source: China receives first set of Russian S-400 air defense system – Business Insider
