Trump publicly chastises NATO allies at a major summit in Brussels. Sir Adam Thomas, former British envoy to NATO, says that strategy could backfire.

British Prime Minister Theresa May faces a string of high-level resignations prompted by her handling of Brexit.

U.S. tariffs against China first announced months ago have finally gone into effect, with few signs of an end to a brewing trade war in sight.

President Trump flexes the power of his pen (and his Twitter fingers) to try and sway NATO spending and global oil prices.

A Greenpeace stunt in France exposes major gaps in nuclear security. Is the US doing better at guarding its nuclear energy and weapons sites?

Could Mexico's president-elect become an odd bedfellow with President Trump over immigration?

Satellite imagery reveals a flurry of activity at a North Korean nuclear site, but thanks to a vague deal signed in Singapore, it's unclear if North Korea is breaching agreements its made with the US.

The UN's World Drug Report finds global use and abuse of drugs is on the rise, as synthetic opioids wreak havoc across Asia, Africa and the Americas.

The World Health Organization reports a new case of vaccine-derived polio on the Pacific island of Papua New Guinea. The WHO's Director of Polio Eradication, Jose Zaffran, puts that development in context.