Brussels, Mar 31 (PTI) : In the backdrop of terror attacks here last week, Prime Minister Narendra Modi highlighted the dangers posed by terrorism to the world and said the UN should address such major challenges failing which the global body could be rendered irrelevant.

Addressing Indian diaspora here, he said it was unfortunate that the UN was still unable to define terrorism and act on a resolution which prescribes action against the countries which support or give shelter to terrorism.

Underlining that terrorism needs to be delinked from religion, Modi said the menace posed challenge to humanity and those believing in humanity should collectively fight it.

He said that terrorism cannot be defeated only by guns, but an environment needs to be created in the society to ensure that the youth are not radicalised.

He said that while world was feeling the impact of terrorism only now, India has been facing this menace for over last 40 years.

"The world was jolted by 9/11. Till then the world powers did not understand what India was going through. But India never bowed to terrorism and there is no question of bowing before it," the Prime Minister said.

Referring to the UN, Modi said it has all means and mechanism to deal with war. But unfortunately the UN does not know what the definition of terrorism is and how to address it.

"The UN could not perform its duty in this regard...if the UN does not address this problem, it will not be too far before the world body loses its relevance," he said.

The leaders of the world will have to take the lead to curb terrorism failing which the world can see more destruction.

During his one hour address, he also highlighted the achievements of his government with regard to ending corruption, bringing transparency in the functioning of government while citing various programmes.