Data released in April showed China's trade with North Korea grew 37.4 percent year on year in the first quarter, in spite of a ban on coal imports China announced in February.
China's Customs Administration announced Thursday that trade with the worldwide pariah North grew 10.5 percent to $2.5 billion between January and June, with exports soaring to 29.1 percent during that period.
He did not though make clear whether China believed North Korea's latest missile test last week, which the United States described as a first ICBM test, was of that type of missile.
Cui said China backed further United Nations action against North Korea for violations of United Nations resolutions such as nuclear tests and launches of intercontinental ballistic missiles (ICBMs).
Exports rose 11.3 percent from a year ago to $196.59 billion, the customs administration said, topping a Bloomberg News forecast of 8.9 percent.
China's overseas shipments rose from a year earlier in June as global demand holds up and trade tensions with the US are kept in check amid ongoing talks.
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The growth bilateral trade "should not be used as basis for questioning China's solemn attitude towards the implementation of the Security Council's resolutions", Huang Songping, a spokesman for Chinese Customs, told reporters in Beijing.
Notably, China's coal imports from North Korea dropped precipitously, with only 2.7 million tons being shipped in the first half of 2017, down 75 percent from 2016.
The overall rise in trade has been driven by China's exports to North Korea, which were up by almost 30% in the first half of the year.
President Trump criticized Beijing for the purchases last week, saying China is not using its economic leverage to halt North Korea's nuclear weapons and missile program.
Iron ore is among China's biggest imports from the North after it stopped buying coal this year due to the sanctions. Imports have fallen since March, when they declined 36.5 percent, he said. "We are skeptical that the current pace of imports can be sustained for much longer given the increasing headwinds to China's economy from policy tightening".
Though Trump took a more conciliatory tone on the North Korea issue and China's role at a meeting with Chinese President Xi Jinping.