A top North Korean diplomat on Tuesday warned that his country is ready to send “more gift packages” to the United States as world powers struggled for a response to Pyongyang’s latest nuclear weapons test.

Han Tae Song, ambassador to the United Nations in Geneva, confirmed that North Korea had successfully conducted its sixth and largest nuclear bomb test on Sunday.

”The recent self-defense measures by my country, DPRK, are a gift package addressed to none other than the U.S.,” Han told a disarmament conference, using the acronym for the Democratic People’s Republic of Korea, the country’s formal name.

“The U.S. will receive more ‘gift packages’ … as long as it relies on reckless provocations and futile attempts to put pressure on the DPRK,” he added without elaborating.

U.S. Ambassador to the United Nations Nikki Haley on Monday accused North Korean leader Kim Jong Un of “begging for war” with a series of nuclear bomb and missile tests, and urged the 15-member Security Council to impose the “strongest possible” sanctions to deter him and shut down his trading partners.

But Russia’s U.N. Ambassador Vassily Nebenzia said on Tuesday a U.S. bid for the Security Council to vote on Sept. 11 on new sanctions is “a little premature.” Russia is a permanent member of the Security Council and wields veto power.

“I don’t think we’ll be able to rush it so fast,” Nebenzia told reporters. Russian President Vladimir Putin earlier on Tuesday said imposing more sanctions was a “road to nowhere.”

U.S. stocks sank, with the S&P 500 stumbling to its biggest single-day loss in about three weeks, as investors weighed the increasing tensions with North Korea.

Sanctions have done little to stop North Korea boosting its nuclear and missile capacity as it faces off with U.S. President Donald Trump who has vowed to stop Pyongyang from being able to hit the mainland United States with a nuclear weapon. REUTERS