The Vietnam People's Armed Forces consists of the Vietnam People's Army (VPA), the Vietnam People's Public Security and the Vietnam Self-Defence Militia. The VPA is the official name for the active military services of Vietnam, and is subdivided into the Vietnam People's Ground Forces, the Vietnam People's Navy, the Vietnam People's Air Force, the Vietnam Border Guard and the Vietnam Coast Guard. The VPA has an active manpower of around 450,000, but its total strength, including paramilitary forces, may be as high as 5,000,000. In 2015, Vietnam's military expenditure totalled approximately US$4.4 billion, equivalent to around 8% of its total government spending. Joint military exercises and war games have been held with Brunei, India, Japan, Laos, Russia, Singapore and the US. In 2017, Vietnam signed the UN treaty on the Prohibition of Nuclear Weapons.