Stugna
Stugna () is a gun-launched antitank guided missile (ATGM) designed to be launched from a 100-mm antitank gun like the MT-12 Rapira or the main gun of a T-55 tank. The Stugna gun-launched missile shouldn’t be confused with the Stugna-P portable missile system, also called Skif. References 

 State Kyiv Design Bureau Luch, "‘STUGNA' round comprising antitank guided missile” (designer’s page) 

Anti-tank guided missiles of Ukraine