Vremevsky area: Russian forces use BMP-3 100mm cannon for direct artillery support

Maximum range of 100mm cannon, explosive(HE-FRAG)shells range up to 6.5km. Fire adjustment is carried out using a quadrocopter! Kamchatka marines have mastered accurate shooting from BMP-3 cannon from closed firing positions, which is similar to the work of artillery. This allows you to hit the APU from a greater distance.
https://en.wikipedia.org/wiki/BMP-3#Weaponry_and_optics
https://en.wikipedia.org/wiki/2A70