Ukrainian President Volodymyr Zelensky escalated his criticism of Western leaders for their reluctance to tighten sanctions on Russia or provide heavier weapons for Ukraine’s defense, as delegations from Kyiv and Moscow met for cease-fire talks in Turkey.

Mr. Zelensky, in a televised address late Monday, called for tougher sanctions, including an embargo on Russian oil sales to the European Union, to be implemented immediately rather than waiting for Moscow to step up its attacks, for example by using chemical weapons.

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