Oleksiy Danilov tells the BBC that Kyiv has an 'historic opportunity' to strike a major blow to Russia.
Mr Danilov said the armed forces would begin the assault when commanders calculated "we can have the best result at that point of the war".
"We have to understand that that historic opportunity that is given to us - by God - to our country we cannot lose, so we can truly become an independent, big European country.""It would be weird if I were to name dates of the start of that or those events. That cannot be done…. We have a very responsible task before our country. And we understand that we have no right to make a mistake.
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