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Volodymyr Oleksandrovych Zelenskyy is a Ukrainian politician, former actor and comedian, who is the sixth and incumbent president of Ukraine.
Pope Francis has said previously that he wants to visit both Kyiv and Moscow on a peace mission.
Russia announced on Wednesday it would withdraw from the west bank of the Dnipro that includes Kherson, the only regional capital Moscow has captured since invading Ukraine in February.
Kryvyi Rih, the largest city in central Ukraine with an estimated pre-war population of 650,000, was hit by eight cruise missiles on Wednesday.
Ukraine's ambassadors to Germany, the Czech Republic, Norway and Hungary were the others fired. It was not immediately clear if the envoys would be assigned new positions.
Meanwhile, British Prime Minister Boris Johnson made a surprise visit to Kyiv on Friday and offered a stepped-up training for Ukrainian forces.
Zelenskyy's criticism of the West has mounted in recent days as the European Union moves slowly towards a possible Russian oil embargo and as thousands of Russian forces try to encircle two key eastern cities of Sievierodonetsk and Lysychansk.
Russian-backed separatists already controlled swathes of territory in Luhansk and the neighbouring Donetsk province before the Feb. 24 invasion, but Moscow wants to seize the last remaining Ukrainian-held territory in Donbas.
'We must be victorious. We need cinema to guarantee this ending, that each time it will be on the side of freedom,' said the Ukraine leader through a live video link from Kyiv during the opening ceremony.
Rustam Minnekayev, deputy commander of Russia's central military district, was quoted by Russian state news agencies as saying full control over southern Ukraine would give it access to Transnistria, a breakaway Russian-occupied part of Moldova in the west.
Johnson is the latest foreign leader to visit Kyiv after Russian forces pulled back from the outskirts of the capital last week.