Antonio Guterres declared the “Cold War is back” after meeting with European Commission President Jean-Claude Juncker to discuss a number of global issues, including the Iran nuclear deal.
The leading diplomat insisted the modern day “Cold War” is lacking serious mechanisms to “make sure things out spiral out of control”.
Speaking to reporters in the wake of the talks, Mr Guterres said: “We live in a dangerous world.
“For the first time in many decades the nonproliferation regimes – both in relation to nuclear weapons and chemical weapons – are put into question.
“We have the Cold War back, with a difference. Today, there are not the mechanisms that existed in the past Cold War – of dialogue, contact, control, to make sure things won’t spiral out of control by any kind of incident.”
Mr Guterres stressed the growing threat of terrorism and its link to a multitude of conflicts across the globe.
The UN Secretary-General even warned about the potential impacts of artificial intelligence and genetic engineer on society as he continued his warning.
The diplomat said: “We are facing a fourth industrial revolution, that again we hope will bring enormous benefits to mankind, but when one thinks about genetic engineering and artificial intelligence and many over developments, it’s clear there will be a huge impact in our economies, societies and labour markets.
“Many factors could be detrimental to the wellbeing of humankind.
“In this dangerous world, it is absolutely essential to preserve two things – multilateral governance institutions and the rule of law across international relations.”
It has been a turbulent week for the United Nations, with the organisation holding an emergency meeting in the wake of Monday’s horrific death toll at the Gaza border.
The meeting descended into a series of furious exchanges between Israeli and Palestinian envoys after 60 Palestinians and nearly 2,000 more were wounded on the controversial border.
Karen Pierce, the UK’s UN ambassador, said: “There is an urgent need we believe to establish the facts around yesterday’s events, including why such a volume of live fire continues to be deemed justified.
“The Palestinian right to peaceful protest is undeniable, but at the same time, we are deeply concerned that peaceful protests in Gaza are being exploited by extremist elements.”
Her American counterpart Nikki Haley produced a different statement, instead praising Israel for its restraint and insisted Hamas terrorists are to blame for the violence.
She said: “In recent days Hamas terrorists backed by Iran have incited attacks against Israeli security forces and infrastructure.
“The common thread in all of this is the destabilising conduct of the Iranian regime, a regime that insists on promoting violence throughout the Middle East while depriving its own people of basic human rights.”