The ROKS-2 and ROKS-3 were man-portable flamethrowers used by the USSR in the Second World War. The ROKS-2 was designed not to draw attention so the fuel tank was designed to be easy to conceal within a knapsack, and the fuel pipe designed to resemble a rifle. ROKS-3 was a simplified design and had a regular cylindrical fuel tank. The Finnish designation for captured ROKS-2 units was liekinheitin M/41-r.
Roks-2 were used, amongst other engagements, during the close-range fighting during the first days of the battle of Kursk in 1943.