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Prime Minister Jacinda Ardern of New Zealand announced that she would not seek re-election and would step down on Feb. 7.

“I believe that leading a country is the most privileged job anyone could ever have, but also one of the more challenging,” Ms. Ardern said. “You cannot and should not do it unless you have a full tank plus a bit in reserve for those unexpected challenges.”

Labour lawmakers will elect a new leader of the party — and the country — in three days’ time, Ms. Ardern said.