Speaking at a Brussels commemoration event for the September 11 attacks, Jens Stoltenberg said Europe needs to prepare for a world where Russia could place nuclear-capable missiles on its doorstep.
Russia honours 'national heroes' killed in mysterious rocket blast
Nagasaki Mayor Tomihisa Taue said Japan had a responsibility to sign a nuclear treaty ban and maintain a "philosophy of peace" within the nation's constitution
"We are no longer in the classic strategy of deterrence by accumulation of nuclear warheads," a SIPRI expert told Euronews. "Now they have embarked on a tactical war."
South Asia is a nuclear flashpoint, expert tells Euronews
US-North Korea talks fail due to sanctions disagreement
If I wasn't ready to disarm, I wouldn't be here, says Kim Jong Un
A Russian state TV news show has named a list of targets in the US it claims Moscow would aim to destroy in the event of a nuclear confrontation.
The North Korean leader received a good send-off as he boarded a train for the two-journey to Vietnam where he's meeting US President Donald Trump for talks about denuclearisation of the Korean peninsula.
The activists are calling for the removal of nuclear weapons from Europe.
The US and Russia have abandoned the 1987 INF treaty that prevented both countries from developing nuclear missiles.
Kim Jong Un reaffirmed his resolve to rid the Korean Peninsula of nuclear weapons programmes, but his TV address contained a clear warning to Washington.
Russia warns of a retaliation if the US exits a cold-war era missile treaty.
Vladimir Putin’s claim that Russian victims of a foreign nuclear strike would go to heaven as martyrs has sparked a bizarre stunt in an aptly-named Russian city.
Putin wants to continue treaty talks with Trump in November
US envoy Bolton holds talks with Russia's Lavrov on nuclear treaty
Donald Trump warned he will pull out of a Cold War nuclear weapons treaty with Russia.
The US Secretary of State has invited North Korea’s foreign minister for talks next week and aims to achieve denuclearisation by 2021.
As a next step, North Korea will allow experts from "concerned countries" to watch the its closure
No long-range missiles were on display on Sunday as North Korea staged a military parade to mark the 70th anniversary of its founding.
China hit back at Donald Trump, calling the US President "irresponsible" for blaming Beijing in holding up denuclearisation progress with North Korea, a day after he cancelled his top diplomat's trip to the hermit kingdom.
Russia is launching an operation to recover a nuclear-armed cruise missile that came down in the Barents Sea in 2017, according to CNBC intelligence sources.
Amidst efforts to strengthen its military security and potential, Russia has released footage of what is claimed to be the world's most technologically-advanced strategic weaponry.
But leaked U.S. intelligence findings have concluded that North Korea does not intend to give up its nuclear programme completely.
North Korea has claimed the US has a regrettable attitude in talks over denuclearisation.
Evaluating the Trump-Kim Singapore summit: who gave up what - and by how much?