Donald Trump with China's President Xi Jinping in Buenos Aires, Argentina. File Photo

China is digging in for a tough period of deteriorating ties with the United States, fanning the flames of patriotism with Korean War films, a viral song on the trade war, and editorials lambasting Washington.

The trade spat has turned into a war of words since President Donald Trump blacklisted Huawei last week over concerns the telecom giant's equipment could be used by Beijing for espionage.

The move, which bans US companies from providing technology Huawei needs, came as the two sides have yet to resume trade negotiations after they exchanged steep increases in tariffs.

A commentary on state-run Xinhua news agency Friday said China now had a "deeper understanding" of US "capriciousness" and was ready to fight with its "Long March" spirit.

It echoes President Xi Jinping's tough stance when he called on cadres earlier this week to brace themselves for a "new Long March" -- recalling the legendary strategic retreat by Communist revolutionaries in the 1930s who regrouped and went on to triumph in 1949.

Xi warned local officials of "complicated and long-term effects" of external influences.

The world's top two economies will "go through a long period of irrational conflict," said Zhang Yansheng, chief researcher at the China Center for International Economic Exchanges, at a government organised briefing Wednesday.

"And then during this process, step by step... come to understand each other, resist each other, and (finally) cooperate with each other."

Agence France-Presse