Ukrainians with kind of ammunition crushing Mannerheim Line

Artillery systems 2S7/7M Pion/Malka have been active in fighting since the beginning of the war in Ukraine, experiencing their second youth. They are frequently utilized as alleged siege artillery, which allows for a more effective demolition of the position of the reinforced opponent against the more common cannonhaubic 152/155 mm. However, their primary problem is the deficiency of manufactured ammunition that forced Ukrainians to scope for ammunition in the same caliber that the Soviets utilized to shoot, among others, the Finnish Mannerheim Line.