"Of all the threats to global security and peace, the most dangerous is the proliferation and potential use of nuclear weapons," Obama said in an op-ed in The Washington Post on the eve of the fourth Nuclear Security Summit, which among others is being attended by leaders from countries like India, Japan, China, South Korea and Brazil.

The Indian delegation is being led by Prime Minister Narendra Modi.

"Today, I’ll welcome more than 50 world leaders to our fourth Nuclear Security Summit to advance a central pillar of our Prague Agenda: preventing terrorists from obtaining and using a nuclear weapon," Obama wrote.

Given the continued threat posed by organisations such as the terrorist group IS, Obama wrote, world leaders will also join allies and partners in reviewing their counterterrorism efforts, to prevent the world's most dangerous networks from obtaining the world's most dangerous weapons.

Obama said the international community must remain united in the face of North Korea's continued provocations, including its recent nuclear test and missile launches.

The additional sanctions recently imposed on Pyongyang by the UN Security Council show that violations have consequences, he said
    
The US will continue working with allies and partners for the complete and verifiable denuclearisation of the Korean Peninsula in a peaceful manner, he said.

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