Emulating his late father and grandfather, who took epic train trips when they were leaders, Kim set off on the long journey from Pyongyang, with a military honour guard seeing him off in the North Korean capital.
French authorities have deployed thousands of police on Paris' Champs-Elysees avenue to try to contain protests by people angry over rising taxes and high costs of living under President Emmanuel Macron's government.
The opposition argues the overhaul would negatively impact about 17 million retirees, as formula used to calculate benefits would be altered.
The protest in central Moscow was organised by the Open Russia movement. At least 500 people handed over a petition for President Vladimir Putin to quit.
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