Ukraine's top security official Oleksiy Danilov said on Wednesday that Ukraine would impose a state of emergency on all of its territories, apart from the Donetsk and Luhansk regions where it has been in place since 2014.
He said that the emergency state would last 30 days and could be extended for another 30 days.
Pro-Russian separatists have controlled parts of Donetsk and Luhansk since 2014. Russia recognized them as independent states and approved the use of its troops abroad this week.
Danilov also said that Ukraine's President Volodymyr Zelenskiy had not discussed the development of nuclear weapons, something Vladimir Putin has said posed a strategic threat for Russia.