This report investigates the claims of Russian involvement in the attacks leading up to and during the assault on Novoazovs’k between 23 and 27 Aug. 2014. The report analyzes open source evidence to determine the source of artillery fire on Ukrainian units, as well as the origin of armored vehicles sighted inside Ukraine in the Novoazovs’k area.
Bellingcat report: Attacks from Russia during the Novoazovs’k Offensive of August 2014

Members of Ukrainian volunteer battalion Dnipro stand in a truck covered in steel plates near the small southern Ukrainian city of Novoazovsk, Donetsk region, on Aug. 27, 2014.