The Asian country you seek is North Korea.
by using less technology and by doing chemical works safely.
Surface burst, but any nuclear weapon can be capable of doing that.
Unable to answer without specifics on which Milton Jenkins and when and where he might have done work on nuclear weapons or their components. Many nuclear weapon components are so highly classified that even the people making them do not know that the component is a part of a nuclear weapon. So it is even possible that there may once have been a Milton Jenkins working somewhere on a nuclear weapon component and he had no idea that was what he was doing (he would be unable to identify without a solid suspicion and a FOIA request).
The US believes that the Iranian government is doing many things. Most importantly, it believes that the Iranian government is trying to create a nuclear weapon and that it is actively supporting Hezbollah and Bashar al-Assad.
Depends on who you are and what you are doing .
by 2 things. the threat of nuclear war, and by doing one task that seemed impossible, the Berlin airlift.
Many governments have spy's for the reason to prevent war. By determining what another country is doing with new weapon research or biological research they can determine a coarse of action in offense or defense.
government is doing nothing to prevent poaching
It depends a great deal on what the nuclear physicist is actually doing.
Pilipins
Developing, very quickly.