Ukrainian Foreign Minister Pavlo Klimkin said he would meet Russia's Sergei Lavrov and the foreign ministers of Germany and France on Sunday in Berlin. "It can be at a square table or a round table but we have to talk," Klimkin said in a Twitter post.
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His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."
The company’s recently appointed Chief Executive Dara Khosrowshahi said the breach was made by two individuals outside the company.