Chinese soldiers from the People's Liberation Army march after a ceremony marking the 70th anniversary of China's entry into the Korean War, on October 23, 2020 at the Great Hall of the People in Beijing, China

BEIJING: President Xi Jinping on Friday warned of China's military resolve to defeat "invaders", speaking on a 70th anniversary for the Korean War, the only time Chinese forces have fought the United States.

In a long speech, heavy on patriotism and flecked by anecdotes of heroism by Chinese forces, Xi said victory in the 1950-53 conflict was a reminder that his nation stood ready to fight anyone "creating trouble... on China's doorstep".

Beijing frequently uses war anniversaries to fire thinly covered warnings to the US of the military strength of the "new China".

The Korean War is a key foundation story for the ruling Communist Party.

Friday's anniversary comes as the party is called out by US President Donald Trump, in a bitter row spanning trade, tech, human rights and the status of Taiwan, which China says is an inviolable part of the mainland.

Without explicitly naming the US, Xi loaded up with the historical precedent of the Korean war and took swings at modern day "unilateralism, protectionism and extreme egoism".

"Chinese people don't create troubles, nor are we afraid of them," Xi said to applause.

"We will never sit back and watch any damage to our national sovereignty... and we will never allow any force to invade or divide the sacred territory of the motherland."

On Wednesday, the Pentagon announced it had agreed to sell over one billion dollars' worth of missiles to self-governing Taiwan, the sharpest potential flashpoint with US forces.

- 'Sacrifice' - The Korean War was the first and so far only time Chinese and US forces have engaged in large-scale direct combat.

According to the Chinese government, more than 197,000 Chinese soldiers died during the three-year war, which saw the US-led United Nations coalition pushed back to the 38th parallel bisecting the Korean Peninsula, after China weighed in on the side of North Korea's communist army.

The war, essentially fought to a bloody stalemate, is hailed in China as a victory and an example of resilience and spirit against a more advanced foe.

"When China was very poor, it didn't surrender to US pressure," an editorial in the nationalist Global Times said this week.

"Today, China has grown to be a strong country, so there is no reason for China to fear the US threats and suppression."

With tensions at their highest in decades between Beijing and Washington, China is making much of the 70th anniversary of its forces entering the fight, intended as much for domestic consumption as it is a warning to its superpower rivals.

Chinese state media have unleashed a wave of propaganda with daily interviews with Chinese veterans who survived the war during prime-time news over the past week.

An action-thriller "Sacrifice", directed by three of the biggest names in Chinese cinema and depicting a small band of Chinese troops holding off US forces in the final days of the war hit cinemas across the country on Friday.

"This should be seen as a message directly addressed to the United States, there is no ambiguity here", Alice Ekman, an analyst specialising on China at the European Union Institute for Security Studies said before the speech.

"Xi is invoking the spirit of war in a broad sense."

China and North Korea have worked to improve relations in the past two years after they deteriorated as Beijing backed a series of UN sanctions against Pyongyang over its nuclear activities.

Xi and North Korean leader Kim Jong Un have met five times since March 2018, even as nuclear negotiations between Washington and Pyongyang have hit a standstill.

By commemorating the anniversary "China is declaring to the US that it was not afraid of the US in the past, and is still not afraid of the US now", said Shi Yinhong, professor of international politics at Renmin University.

"It's to prepare for a possible limited military conflict with the US", Shi said.