Russian helicopters go to the position during the Center-2019 military exercise in Novosibirsk region, Russia, on Sept. 19, 2019. Tsentr-2019 (Center-2019) military exercises involving eight countries began on Monday in Russia, Kazakhstan and Tajikistan, the Russian Defense Ministry said in a statement on Tuesday. (Photos: Xinhua)

Russian military vehicle fires during the Center-2019 military exercise in Novosibirsk region, Russia, on Sept. 19, 2019. Tsentr-2019 (Center-2019) military exercises involving eight countries began on Monday in Russia, Kazakhstan and Tajikistan, the Russian Defense Ministry said in a statement on Tuesday.

Russian military vehicle goes to the position during the Center-2019 military exercise in Novosibirsk region, Russia, on Sept. 19, 2019. Tsentr-2019 (Center-2019) military exercises involving eight countries began on Monday in Russia, Kazakhstan and Tajikistan, the Russian Defense Ministry said in a statement on Tuesday.