ISLAMABAD (AP) — Uneasy neighbors Pakistan and India, who regularly trade gunfire in the disputed Kashmir region, are sticking to a 20-year-old agreement to exchange information on their nuclear installations and facilities.

In a statement Tuesday, Pakistan's foreign ministry said the 1988 agreement requires each country to hand over the list on Jan. 1 each year, which the representatives of the two countries did on Monday. It has been adhered to every year since 1992, the statement said.

Although neither country is signatory to the Nuclear Non-Proliferation Treaty (NPT), they both became declared nuclear powers after India conducted an underground nuclear weapons test in 1998 and Pakistan followed suit a few weeks later.

Pakistan and India have fought three wars since the 1947 creation of Pakistan from a larger India.