"In the first half of the 20th century, Japanese militarists carried out barbarous wars of aggression against China and Korea, swallowing up Korea and occupying half of the Chinese mainland," Xi said in his address at Seoul National University.
"When the war against Japan was at its highest pitch, the Chinese and Korean people shared their suffering and helped each other with sweat and blood," he said.
Xi's speech came on the second and last day of his state trip to South Korea which had been flagged as a snub to ally North Korea because of his decision to visit Seoul before Pyongyang.
But the key issue of North Korea's nuclear weapons barely got a mention in his address, beyond a passing reference to the need for a "denuclearized Korean Peninsula" and the need to resolve all tensions and problems through dialogue.
The hard-hitting language was saved for recalling Japan's repressive colonial rule and wartime aggression, a message guaranteed to go down well in Seoul.
Relations between Seoul and Tokyo are currently at their lowest ebb for years, mired in disputes related to Japan's 1910-45 rule of the peninsula.
China is also embroiled in a territorial row with Japan and analysts say Xi's efforts to stake out common cause with South Korea reflect a wider diplomatic strategy.
South Korea and Japan are the two key U.S. military allies in the region, and exploiting any rift between them would help China in countering U.S. President Barack Obama's strategic "pivot" to Asia. Xi's evocation of Tokyo's military past carried particular resonance in the wake of Prime Minister Shinzo Abe's announcement this week that Japan's powerful military had the right to go into battle in defense of allies.
The shift to a policy of so-called "collective self-defense," marks a highly contentious change in Japan's pacifist stance and was viewed with deep suspicion in Beijing and Seoul.
By Ruchi Singh
reporter
Park Sae-jin
swatchsjp@ajunews.com
