As Russian President Vladimir Putin and Chinese President Xi Jinping strolled side by side in Beijing, they casually chatted about life-prolonging organ transplants and the idea of living forever.

The exchange between the two world leaders was caught on a hot mic Wednesday as they joined North Korean leader Kim Jong Un in their first-ever joint public appearance. They were among a delegation of 27 world leaders attending a military parade in Beijing, which marked the 80th anniversary of the end of World War II.

Images from the historic moment show the trio walking down a red carpet in Tiananmen Square and vigorously shaking hands as they made small talk. Putin and Xi, who are both 72, specifically appeared to be discussing advancements in medicine and technology — and the subsequen

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