In the field of diplomacy, Donald Trump is as “ignorant as a child,” according to a propaganda paper run by the Chinese Communist party.

The remarks are the latest salvo in the war of words heating up between Trump and China, which comes on the heels of the president-elect taking a congratulatory phone call from the democratically elected leader of Taiwan.

In a weekend interview on “Fox News Sunday,” Trump defended his move. “Why should some other nation be able to say I can’t take a call?” he said. “I think it actually would’ve been very disrespectful, to be honest with you, not taking it.”

Trump added that he doesn’t feel “bound by a one-China policy unless we make a deal with China having to do with other things, including trade.”

The Communists responded with name-calling and threats.

“China needs to launch a resolute struggle with him,” said an editorial in the Communist party organ, the Global Times.

“Only after he’s hit some obstacles and truly understands that China and the rest of the world are not to be bullied will he gain some perception,” it continued.

“Many people might be surprised at how the new US leader is truly a ‘businessman’ through-and-through,” the paper added.

A spokesman for China’s foreign minister, Geng Shuang, was a bit more restrained, but said his nation had “serious concern” over Trump.

“We urge the new US leader and government to fully understand the seriousness of the Taiwan issue, and to continue to stick to the one-China policy,” he said.

With Post wires