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German Chancellor Angela Merkel has said she is fine, after she was seen trembling as she greeted Ukraine's president on a boiling day in Berlin.

Mrs Merkel, 64, was visibly struggling as she stood next to Volodymyr Zelensky while a military band played the two countries' anthems in the midday sun.

The temperatures in the German capital were approaching 30C (86F) at the time.

Mrs Merkel said she was dehydrated. "I've drunk at least three glasses of water and so I'm doing very well now."

The chancellor was answering a question about her wellbeing at a joint news conference with President Zelensky.

Meanwhile, Mr Zelensky, a comedian-turned-president, said that he would have come to the rescue if needed.

"She was standing next to me and completely safe," he said.

Ms Merkel is one of the European Union's most influential politicians.

She has announced that she will step down when her current - fourth - term runs out in 2021.