China on Friday denied reports that it was selling oil products to North Korea, despite sanctions issued by the United Nations.

China’s clarification comes after United States President Donald Trump said he was unhappy with China for letting oil reach the isolated nation. “Caught RED-HANDED,” Trump had said on Twitter on Friday.

Earlier this week, South Korean newspaper Chosun Ilbo quoting government sources said US spy satellites had caught Chinese ships transferring oil to North Korean vessels 30 times since October.

Reacting to the reports and Trump’s remarks, Chinese Foreign Ministry spokesperson Hua Chunying (pictured above) told reporters, “In reality, the ship in question has, since August, not docked at a Chinese port and there is no record of it entering or leaving a Chinese port.” She said the reports “did not accord with facts”.

Hua said China has “always implemented” the UN Security Council resolutions on North Korea. “We never allow Chinese companies and citizens to violate the resolutions.”

She added that if an investigation confirmed there were violations of the UN resolutions, China will “deal with them seriously in accordance with laws and regulations”.

While US officials have not confirmed the details of the South Korean report, a US State Department official said Washington had evidence that vessels from several countries, including China, had shipped oil products and coal, Reuters reported.