"Right now, the question of our country's future - whether we will survive as an independent country or not - is still open," he told the Financial Times.
The statement comes at a time of intense Russian attacks on the capital. In the middle of winter, when temperatures in Kyiv have dropped to minus 20 degrees Celsius in places, Russian attacks on energy facilities and power plants have left many in the city without electricity, heat and water.
"(Vladimir) Putin's main goal is not Donetsk, not Luhansk, not Crimea. His main goal is Kyiv and all of Ukraine," says Klitschko.
He wants to destroy our independence.
What do you think?