I don't think Liechtenstein has any.
The United States of America was the country that developed the first nuclear weapons.
As each side's intelligence agencies could not accurately estimate the stockpile and ability to expand the enemy stockpile was always overestimated, forcing decision makers into continuing to expand their stockpile. This applies to conventional weapons as well as nuclear.
R. E. Kidder has written: 'Maintaining the U.S. stockpile of nuclear weapons during a low-threshold or comprehensive test ban' -- subject(s): Nuclear disarmament, Nuclear weapons, Testing
Yes, China's first nuclear test took place in 1964, and they have roughly 200 warheads at this time; depending on who you ask. China also has a "no first use rule" meaning that they will only use nuclear weapons in retaliation.
An amount of nuclear weapons a country has
Russia currently owns the biggest stockpile of nuclear weapons in the world. Also Russia made and detonated the biggest nuclear bomb in history called the Tsar bomb.
A total of more than 70,000 nuclear weapons of various types were made, many of these were recycled to make newer models.At the peak of the cold war the US nuclear stockpile had 10,000 high yield strategic nuclear weapons and 40,000 medium and low yield tactical nuclear weapons.
A country's stance on nuclear weapons or if they have any.
~17,300 as of 2014, according to the Ploughshares Fund and the Bulletin of the Atomic Scientists (including both active stockpile and retired but not yet dismantled).For the current estimate and a downloadable copy of the Bulletin of the Atomic Scientists report (PDF) on historical active stockpile sizes use the Ploughshares Fund: World Nuclear Stockpile Report link.
Only two nuclear weapons have been used in combat, both quite primitive designs to the weapons that are deployed today. The weapon with the most quantities in the current active US nuclear stockpile is the W76/Mk-4 warhead.
The US was the first to start testing nuclear weapons
The first Islamic country to have nuclear weapons was Pakistan.