United Nations Secretary-General Antonio Guterres said Tuesday the solution to containing North Korea as the regime conducts continued nuclear weapons tests "must be political" as the "potential consequences to military action are too horrific."

Guterres said he would be ready to support any efforts towards bringing about denuclearization in the Korean Peninsula in a peaceful manner.

Guterres's comments came hours after a top North Korean diplomat warned that his country is ready to send "more gift packages" to the United States

Han Tae Song, ambassador to the United Nations in Geneva, confirmed that North Korea, officially known as the Democratic People's Republic of Korea (DPRK), had successfully conducted its sixth and largest nuclear bomb test on Sunday.

"The recent self-defence measures by my country, DPRK, are a gift package addressed to none other than the U.S.," Han told a disarmament conference. "The U.S. will receive more 'gift packages' from my country as long as its relies on reckless provocations and futile attempts to put pressure on the DPRK," he added without elaborating.

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North Korea's ambassador to the United Nations Han Tae Song, seen in Switzerland on Tuesday, promised more 'gift packages' for the U.S. are likely to occur. (Denis Balibouse/Reuters)

North Korea says it needs to develop its weapons to defend itself against what it sees as U.S. aggression.

U.S. Ambassador Nikki Haley told an emergency Security Council meeting called in response to North Korea's Sunday nuclear test that the U.S. wants a new UN resolution with tougher sanctions adopted by Sept. 11.

Sanctions a 'road to nowhere': Putin

But Vassily Nebenzia, Russia's UN ambassador called that date "a little premature" and stressed that a military option should be "ruled out of any discussions."

Russia is also skeptical of the efficacy of more sanctions.

Nebenzia said that despite good intentions, sanctions against North Korea aren't working and Moscow wants a new UN resolution to focus more on a political solution of the crisis over North Korea's nuclear and missile programs.

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Russia's U.N. Ambassador Vassily Nebenzia speaks to reporters about the situation in North Korea after attending a Security Council meeting, Wednesday, Aug. 9, 2017, at United Nations headquarters. (AP Photo/Mary Altaffer)

He told reporters at UN headquarters on Tuesday that the only initiative currently on paper is a Chinese-Russian proposal that would halt North Korea's nuclear and missile tests in exchange for the U.S. and South Korea halting their joint military exercises.

But Nebenzia said Russia would welcome other initiatives, noting that the Swiss have offered to mediate, and "if that works, I'll be happy."

Russian President Vladimir Putin earlier on Tuesday described more sanctions as a "road to nowhere."

He said possible new economic sanctions would affect ordinary Koreans, not the nuclear or missile programs.

Haley acknowledged on Tuesday that more sanctions on North Korea are unlikely to change its behavior but would cut off funding for its ballistic missile and nuclear programs.

"Do we think more sanctions are going to work on North Korea? Not necessarily," she told the American Enterprise Institute think-tank in Washington. "But what does it do? It cuts off the revenue that allows them to build ballistic missiles."

White House Press Secretary Sarah Huckabee Sanders said Tuesday "all options are on the table" to deal with North Korea, including diplomatic and economic measures, but said that talks with Pyongyang were not the current focus for the White House.

She also said U.S. President Donald Trump continues to see the denuclearization of the Korean Peninsula as the priority.

"We're going to continue to push for a safer and denuclearized Korean Peninsula, and that's the priority here," she said.

Trump has often adopted a bellicose tone in recent months, promising if necessary to strike North Korea with "fire and fury."

North could be prepping test on anniversary

Wall Street stocks fell on Tuesday as U.S. trading reopened for the first time since the North Korean nuclear bomb test, and the U.S. dollar and Treasury yields fell.

Diplomats have said the Security Council could consider banning North Korean textile exports, banishing its national airline and stopping supplies of oil to the government and military.

Other measures could include preventing North Koreans from working abroad and adding top officials to a blacklist aiming at imposing asset freezes and travel bans. China accounted for 92 per cent of North Korea's trade in 2016, according to South Korea's government.

China's foreign ministry said on Tuesday it would take part in Security Council discussions in "a responsible and constructive manner."

Meanwhile, South Korea said on Tuesday an agreement with its ally the United States to scrap a weight limit on its warheads would help it respond to North Korea's nuclear and missile threat. 

Trump and his South Korean counterpart, Moon Jae-in, agreed on Monday to scrap a warhead weight limit on South Korea's missiles, South Korea's presidential office said, enabling it to strike North Korea with greater force in the event of war.

Trump said he has given the go-ahead for Japan and South Korea to buy a "substantially increased amount" of sophisticated military equipment from the United States.

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President Donald Trump walks with South Korean President Moon Jae-in on June 30. South Korea is looking for more military means to defend itself, with the assistance of the U.S. (Evan Vucci/Associated Press)

In an early morning tweet Tuesday, Trump said, "I am allowing Japan & South Korea to buy a substantially increased amount of highly sophisticated military equipment from the United States."

South Korea and the United States are technically still at war with North Korea after the 1950-53 Korean conflict ended with a truce, not a peace treaty. Both sides have thousands of rockets and artillery pieces aimed at each other across the world's most heavily armed border. 

South Korea's Asia Business Daily, citing an unidentified source, reported that North Korea had been observed moving a rocket that appeared to be an intercontinental ballistic missile (ICBM) towards its west coast.

The rocket started moving on Monday and was spotted moving only at night to avoid surveillance, the newspaper said. South Korea's defence ministry, which warned that North Korea was ready to launch an ICBM at any time, said it was not able to confirm the report.

Analysts and South Korean policymakers believe North Korea may test another weapon on or around Sept. 9, when it celebrates its founding day.

With files from The Associatd Press