The Diplomat:
In an ongoing effort to strengthen its anti-access/area denial (A2/AD) capability, the Russian military took delivery of an additional S-400 Triumf advanced Air Defense System (NATO reporting name: SA-21 Growler) regiment ahead of schedule, according to a July 18 statement by Russian defense contractor Almaz-Antey.
“Almaz-Antey Group has delivered the first regiment set of S-400 Triumf surface-to-air missile systems this year to the Defense Ministry of Russia. The official ceremony was held on the territory of the Kapustin Yar training range in the Astrakhan Region,” the statement reads.
According to The Diplomat‘s analysis, this brings the total number of deployed S-400 regiments in the Russian military to 24. Overall, this number is expected to grow to 28 regimens or 56 battalions by 2020. A S-400 regiment is divided up into two battalions (also called divisions in the Russian military), which in turn are split into two batteries. A battery can consist of up to 12 transporter erector launchers (TELs), although 4 to 8 TELs per unit are more common.
