"Modernization of self-propelled artillery installations based on the modified BMP-3 [infantry fighting vehicle] chassis is underway. These vehicles, equipped with a 120-mm gun …and a 152-mm gun, are capable of significantly increasing the efficiency of motorized rifle units," the spokesperson said.
The "Pat-S" is an experimental 152-mm self-propelled artillery mount developed in the 1980s in the Soviet Union, based on the BMP-3 chassis. It was not mass-produced, only one prototype was made.
"Pat-S" is the world's first large-caliber howitzer capable of overcoming water obstacles afloat by itself.