The upgraded combat module "Duplet," which is designed to modernize armored vehicles, has been successfully tested, Ukrainian President Petro Poroshenko has said.

"Zhytomyr Armor Plant has significantly improved the characteristics of the combat module and equipped it with an upgrade fire system that helps accompany targets in automatic mode, calculate ballistics of ammunition and accurately fire both in daytime and nighttime," Poroshenko wrote on his page on Facebook on Tuesday.