Novichok are a set of molecules that are some of the most deadly nerve agents ever developed. They are almost impossible to detect and clean up.
North Korea's infrastructure is in dire need of expansion and modernisation. This is where the South can help.
At this stage one can only judge the atmospherics and optics of the summit, and on that basis, Beijing and Pyongyang have plainly come out ahead, while Tokyo and Seoul seem to have been overlooked.
Looking at the agreement, it appears that Kim Jong-un has outmanoeuvred Donald Trump.
One noticeable omission was any mention of "complete, verifiable, irreversible denuclearisation" - whether this was strategy or capitulation on President Donald Trump's part remains to be seen.
Alongside denuclearisation, reunification is the biggest potential game-changer on the Korean peninsula. But it remains a pipe dream.
Kim Jong-un may be able to "chat" in English. That's not enough to understand Donald Trump.
Can decades of deadlock be broken by two of the world's most unpredictable leaders?
North Korean leader Kim Jong Un's risky unreliability will diminish as his country builds ties with South Korea. So Korean unification may be a better focus for Tuesday's summit than denuclearization.
The highly awaited summit has the potential to lead to real peace on the peninsula- but only if both countries can find a common interest on which to build an agreement.
With almost 30 percent of South Koreans either Protestant or Catholic, faith plays a big role in how people think about relations with the North.
Having called the June 12 summit off, US President Donald Trump says it might be on again. But at what cost will all of this come to the serious issue of denuclearisation?
A remarkable year on the Korean peninsula has been marked by both bitter enmity and genuine goodwill. Now, the tension is being ratcheted up again.
The South Korean president's careful approach to rapprochement with the North set the stage for a possible breakthrough on the Korean peninsula.
Since the Korean War, U.S. troops have helped South Korea with military training and planning. Our Speed Read describes the regular joint exercises designed to deter North Korean aggression.
After decades of deadly enmity, Libya and the West made a major breakthrough on weapons of mass destruction. How?
You have to walk before you can run, and baby steps are the best way forward in Korea.
Donald Trump has always traded on his image as a master dealmaker – but many deals have been done with North Korea before.
There was much that was agreed to at the Korean summit - but still a lot yet to be worked out. The will now shift to the hotly-anticipated meeting between Donald Trump and Kim Jong-un.
The astonishing sight of two Korean leaders crossing the border that divides them is just a first step.