The Russian military has launched a massive exercise involving 250 aircraft and other weapons, the Associated Press reports.

The Defense Ministry said in a statement Monday, May 25, the drills will involve air force and air defense units of the Central, Western and Southern Military Districts totaling 12,000 servicemen.

Combat aircraft will deploy to temporary bases and air defense systems will be sent to the Ashuluk and Kapustin Yar shooting ranges in southern Russia for training with live ammunition.

It also said long-range Russian bombers will launch cruise missiles at practice targets at a Siberian firing range.

The current drills are preparation for even more massive Center-2015 maneuvers set for later this year.