"We hope all relevant sides can make sure that they are clear that Security Council sanctions imposed on North Korea are not comprehensive economic sanctions". "We are seeing progress there but a lot more has to be done", Johnson told reporters as he arrived for the talks with his counterparts.
According to the statement, North Korea also urged the United States to think of Pyongyang's strategic position, instead of exerting pressure and introducing sanctions against the country. He said Chinese imports from the North fell 36.5 percent in March, 41.6 percent in April and 31.6 percent in May.
At the time, South Korea said it would no longer allow the funds paid at Kaesong to be used in the North's missile and nuclear programmes. "The last such reunions were almost two years ago".
Chinese and North Korean flags outside the closed Ryugyong Korean Restaurant in Ningbo, Zhejiang province, China.
British Foreign Secretary Boris Johnson said more pressure must be put on Pyongyang, particularly from Beijing, its neighbour and main trade partner.
Kim's regime issued its warning against sanctions on the state-run Uriminzokkiri news website, which publishes its propaganda. Washington has dismissed the plan out of hand. It declared that both countries had "refused to fulfill their duties to negotiate" to reach a peaceful solution.More news: Cyber loss potential parallels hurricane risk
"It will be a fatal mistake to consider any chance that the DPRK which rose to a dignified nuclear power and an ICBM state would tolerate the reckless "sanctions" racket of the US and other hostile forces", it said.
The timing and scope of the USA action will depend heavily on how China responds to pressure for tougher steps against North Korea when US and Chinese officials meet for a high-level economic dialogue in Washington on Wednesday, the administration sources told Reuters.
North Korea's ground force must also be taken into account.
North Korea has again vowed to defend itself against what it considers an aggressive USA presence in the region. The missile defense program is meant to shoot down North Korea's shorter range ballistic missiles.
The North's latest ICBM launch has stoked security worries as it showed the country could eventually flawless a reliable nuclear missile capable of reaching anywhere in the United States. Beijing has repeatedly criticised the installation, pointing out that the associated powerful X-band radar can be used to undermine China's nuclear deterrent against a potential United States attack.