Usage patterns
兵器を開発するto develop a weapon
That country is said to be developing a new type of weapon.
兵器を使用するto use a weapon
Using chemical weapons in war is prohibited under international law.
兵器を保有するto possess weapons
Many countries possess nuclear weapons.
兵器を廃棄するto dispose of / scrap weapons
Under the treaty, it was decided that the old weapons would be scrapped.