And it vowed to continue strengthening its nuclear power
North Korea said on Sunday that the United States’ push for further sanctions against the country was “laughable”.
With its fifth and biggest nuclear test on Friday, North Korea vowed to continue strengthening its nuclear power, having reportedly mastered the ability to mount a warhead on a ballistic missile.
A US special envoy met Japanese officials on Sunday, saying later that the US may launch unilateral sanctions against North Korea.
"The group of Obama's running around and talking about meaningless sanctions until today is highly laughable, when their 'strategic patience' policy is completely worn out and they are close to packing up to move out," state-run KCNA news agency cited a North Korean foreign ministry spokesman as saying on Sunday.
The United States, Britain, and France have pushed for new sanctions against North Korea.
Obama said South Korean President Park Geun-hye and Japanese Prime Minister Shinzo Abe had agreed to work with the UN Security Council to enforce existing measures and to take "additional significant steps, including new sanctions".
South Korea's top nuclear envoy also spoke to his Chinese counterpart and emphasised the need for fresh measures, the South Korean foreign ministry said in a statement.
(WION with inputs from agencies)