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Japan occupied much of China before and during WWII in a devastating and brutal invasion that, by some estimates, killed 20 million people. The wartime experience still between the two countries today.

A museum in the Chinese city of Benxi highlights the struggles of anti-Japanese resistance fighters who holed up in log cabins through fierce winters in the country's northeast, then known as , before retreating into Russia.

They returned only after the Soviet Union declared war on Japan and launched an offensive into Manchuria on Aug. 9, 1945 — the same day the U.S. on Nagasaki — adding to the pressure on Japan to surrender.

Nowadays, it is China’s military that raises alarm as it the government’s territorial claims in the Pacific. When Japan talks of to counter the threat, its militaristic past gives China a convenient retort.

“We urge Japan to deeply reflect on its historical culpability, earnestly draw lessons from history and stop using hype over regional tensions and China-related issues to conceal its true intent of military expansion," Chinese Foreign Ministry spokesperson Guo Jiakun said last month.

Japan's surrender broadcast

Hirohito's prerecorded surrender broadcast on Aug. 15, 1945, was incomprehensible to many Japanese. He used arcane language and the sound quality was poor.

What was important, historians say, was that the message came from the emperor himself. was considered a living god, and the war was fought in his name. Most Japanese had never heard his voice before.

“The speech is a reminder of what it took to end the wrong war,� Nihon University professor Takahisa Furukawa told The Associated Press in 2015.

The current emperor, Hirohito’s grandson , and the prime minister are set to make remarks at the annual ceremony in Tokyo on Aug. 15, broadcast live by public broadcaster NHK.

At last year's event, Naruhito expressed deep remorse over Japan’s actions during the war. But on the same day, three Japanese cabinet ministers , drawing criticism from China and South Korea, which see the shrine as a symbol of militarism.

China marks Victory Day

Japan surrendered on Sept. 2, 1945, in a ceremony on board the American battleship USS Missouri.

The foreign minister, in a top hat and tails, and the army chief signed on behalf of Hirohito. The signatories on the other side were U.S. Gen. Douglas MacArthur and representatives from China and other nations that had fought Japan.

China designated the next day, Sept. 3, as Victory Day.

Eleven years ago, the Communist Party stepped up how China marks the anniversary. All of China's top leaders, including President Xi Jinping, attended a commemorative event on Sept. 3. The renewed focus came at a time of rising tension with Japan over conflicting interpretations of wartime history and a in the East China Sea.

The next year, China staged a military parade on the 70th anniversary of the end of the war.

A decade later, preparations are underway for another grand parade with missiles, tanks and fighter jets overhead. Russian President Vladimir Putin is among those expected to attend.