Most people think the world is more dangerous today than it was two years ago as concerns rise over politically motivated violence and weapons of mass destruction, according to a survey released on Tuesday.

Six out of 10 respondents to the survey, commissioned by the Global Challenges Foundation, said the dangers had increased, with conflict and nuclear or chemical weapons seen as more pressing risks than population growth or climate change.

The results come as NATO leaders prepare to meet in Brussels on Wednesday amid growing tensions between the United States and fellow members over defense spending, which some fear could damage morale and play into the hands of Russia.