Russia and China are conducting three days of joint anti-terrorism exercises in Moscow.
The event began Tuesday with a simulation of a hostage situation in an administrative building, complete with attackers wearing helmets and carrying weapons.
The exercises are a followup to large-scale maneuvers last month that involved not just Russia and China but also forces from Kazakhstan, Kyrgyzstan, Tajikistan, and Uzbekistan.
Those exercises were held near Chelyabinsk in Russia, near the border with Kazakhstan.
Some information for this report was provided by AFP.