The Russians will "try to seize" Kiev tonight, said Ukrainian President Volodymyr Zelensky, overnight from Friday to Saturday.
Earlier, Kyiv Mayor Vitali Klitschko said Kyiv had entered a "defensive phase".
The authorities encourage residents to make Molotov cocktails to defend the city.
The UN Security Council failed to pass a resolution condemning the Russian invasion.
Russia vetoed it.
Two strong explosions sounded at dawn on Friday in the center of Kiev.
According to the mayor, three people were injured, one of them seriously.
Fighting is underway north of the capital, according to the Ukrainian army.
It claims to be fighting Russian armored units in two localities, Dymer and Ivankiv, respectively 45 and 80 km north of Kiev.
Russian President Vladimir Putin calls on the Ukrainian military to "take power" in Kiev.
The Europeans, Canada, Great Britain and the United States have decided to sanction Vladimir Putin and his Foreign Minister, Sergei Lavrov.
The Council of Europe, which has 47 members, has decided to suspend Russia.
Russia is banned from participating in the Eurovision Song Contest and deprived of the organization of the Champions League final.
General military mobilization against the invasion of Moscow has been decreed in Ukraine.
The measure will concern those subject to "military conscription and reservists" and will apply within 90 days in all Ukrainian regions.
President Volodymyr Zelensky reported 137 dead on the Ukrainian side.
More than 50,000 Ukrainians have fled their country in less than 48 hours, according to the United Nations.
Emmanuel Macron claimed to have spoken with Vladimir Putin.
He added that France would speed up the deployment of soldiers to Romania.
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