The French have also proposed the 140mm gun. And Russians have had ideas to upgun their Armata tank with a 152mm gun basically from the tanks introduction. But what about other Russian tanks?

three tanks, a German-made Marder infantry fighting vehicle, an armored personnel carrier, four motor vehicles, two 152mm Msta-B howitzers, two 152mm D-20 howitzers, two 122mm Gvozdika motorized ...