An M-ATV or mine resistant ambush protected vehicle is displayed at the 27th International Defence Industry Exhibition in Kielce, Poland, on Sept. 5, 2019. The 27th International Defence Industry Exhibition MSPO, one of the largest in Central and Eastern Europe with around 600 exhibitors, is held here from Sept. 3 to Sept. 6. (Photo by Jaap Arriens/Xinhua)

People are seen on a Polish army T-72 tank at the 27th International Defence Industry Exhibition in Kielce, Poland, on Sept. 5, 2019. The 27th International Defence Industry Exhibition MSPO, one of the largest in Central and Eastern Europe with around 600 exhibitors, is held here from Sept. 3 to Sept. 6. (Photo by Jaap Arriens/Xinhua)

An Apache helicopter is displayed at the 27th International Defence Industry Exhibition in Kielce, Poland, on Sept. 5, 2019. The 27th International Defence Industry Exhibition MSPO, one of the largest in Central and Eastern Europe with around 600 exhibitors, is held here from Sept. 3 to Sept. 6. (Photo by Jaap Arriens/Xinhua)

Tanks are displayed at the 27th International Defence Industry Exhibition in Kielce, Poland, on Sept. 5, 2019. The 27th International Defence Industry Exhibition MSPO, one of the largest in Central and Eastern Europe with around 600 exhibitors, is held here from Sept. 3 to Sept. 6. (Photo by Jaap Arriens/Xinhua)

A NUR-15 radar vehicle is displayed at the 27th International Defence Industry Exhibition in Kielce, Poland, on Sept. 5, 2019. The 27th International Defence Industry Exhibition MSPO, one of the largest in Central and Eastern Europe with around 600 exhibitors, is held here from Sept. 3 to Sept. 6. (Photo by Jaap Arriens/Xinhua)