* Risk of nuclear war greater than in a long time-committee
* Iran not a nuclear threat recently, on the contrary -committee
* Trump, North Korea need to stop -ICAN leader
* Graphic of Nobel laureates: http://tmsnrt.rs/2y6ATVW (Adds quotes from Nobel committee leader, reaction, background)
By Nerijus Adomaitis and Tom Miles
OSLO/GENEVA, Oct 6 (Reuters) - The Norwegian Nobel Committee, warning of a rising risk of nuclear war and the spread of weapons to North Korea, awarded the 2017 Nobel Peace Prize on Friday to a little-known campaign group seeking a global ban on nuclear arms.
The award for the International Campaign to Abolish Nuclear Weapons (ICAN) was unexpected, particularly in a year when the architects of the 2015 nuclear deal between international powers and Iran had been seen as favourites for achieving the sort of diplomatic breakthrough that has won the prize in the past.
ICAN describes itself as a coalition of grassroots non-government groups in more than 100 nations. It began in Australia and was officially launched in Vienna in 2007.
"We live in a world where the risk of nuclear weapons being used is greater than it has been for a long time," said Berit Reiss-Andersen, the leader of the Norwegian Nobel Committee.
"Some states are modernising their nuclear arsenals, and there is a real danger that more countries will try to procure nuclear weapons, as exemplified by North Korea."
ICAN's executive director told Reuters the group was elated. Asked if she had a message for North Korea's Kim Jong-Un, who has tested nuclear arms in defiance of global pressure, and President Donald Trump, who has threatened to "totally destroy" North Korea to protect the United States and its allies, Beatrice Fihn said both leaders need to know that the weapons are illegal.
"Nuclear weapons are illegal. Threatening to use nuclear weapons is illegal. Having nuclear weapons, possessing nuclear weapons, developing nuclear weapons, is illegal, and they need to stop."
The Nobel prize seeks to bolster the case of disarmament amid nuclear tensions between Washington and Pyongyang, as well as uncertainty over the fate of the 2015 deal between Iran and major powers to limit Tehran's nuclear programme.
The committee raised eyebrows with its decision to award the prize to an international campaign group with a relatively low profile, rather than recognising the Iran deal, a complex agreement hammered out over years of high-stakes diplomacy.
"Norwegian Nobel Committee has its own ways, but the nuclear agreement with Iran achieved something real and would have deserved a prize," tweeted Carl Bildt, a former Swedish prime minister who has held top posts as an international diplomat.
The Iran accord, which Trump has repeatedly called "the worst deal ever negotiated," is seen as under particular threat this week. A senior administration official said on Thursday Trump is expected to decertify Iran's compliance, a step towards potentially unwinding the pact.
The committee may have been reluctant to reward the Iranian government for its role in the nuclear deal because the only Iranian winner so far, 2003 laureate Shrin Ebadi, a lawyer and human rights campaigner, is forced to live in exile.
"I think the committee has thought about the human rights situation in Iran. It would have been difficult to explain the prize even though it has a favourable view of the Iran deal," Asle Sveen, a historian of the Nobel Peace Prize, told Reuters.
The Norwegian Nobel committee denied that giving the prize to an anti-nuclear group was intended either as rebuke to Trump or as a snub to the architects of the Iran nuclear deal.
"The Iran treaty is a positive development, a disarmament development that is positive, but the reason we mentioned North Korea (in our statement) is a reference to the threat that people actually feel," Reiss-Andersen told Reuters.
"Iran has not voiced recent threats to use nuclear weapons, on the contrary," she said in an interview.
ICAN has campaigned for a a U.N. Treaty on the Prohibition of Nuclear Weapons, which was adopted by 122 nations in July this year.
The agreement does not include -- and would not apply to -- any of the states that already have nuclear arms, which include the five U.N. Security Council permanent members, the United States, Russia, China, Britain and France, as well as India, Pakistan and North Korea. Israel is also widely assumed to have nuclear weapons, although it neither confirms nor denies it.
Major allies of the declared nuclear powers also oppose the new treaty. The United Nations said the award would help bolster efforts to get the 55 ratifications by countries for the new U.N. treaty to come into force.
"I hope this prize will be conducive for the entry into force of this treaty," U.N. Chief Spokeswoman Alessandra Vellucci told a news briefing.
($1 = 8.1556 Swedish crowns)
(Additional reporting by Joachim Dagenborg, Terje Solsvik, Henrik Stolen, Gwladys Fouche and Alister Doyle in Oslo, Stephanie Nebehay in Geneva, writing by Gwladys Fouche and Alister Doyle, editing by Peter Graff)
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