The Ukrainian government says its forces have retaken two more eastern cities from pro-Russian rebels.
The website of Ukrainian President Petro Poroshenko said the national flag was raised in Artyomivsk and Druzhkivka.
It comes a day after government forces regained control of the rebel stronghold of Sloviansk.
Meanwhile, large crowds have attended a rally in the regional capital, Donetsk, in support of the rebels.
Rebel fighters have re-grouped in Donetsk and are reported to have attacked the state prison guard headquarters in an attempt to seize weapons.
The BBC's David Stern in Kiev says Artyomivsk and Druzhkivka are not considered as strategic as Sloviansk but re-taking them indicates momentum is currently with government forces.
Despite their recent losses, the rebels still hold the regional capitals of Donetsk and Luhansk and other key areas.
However, senior Ukrainian security official Mykhaylo Koval said Luhansk and Donetsk would now be besieged until separatist forces there surrendered.
"There is a clear strategic plan, which has been approved. These cities will be completely blockaded," he said.
"These measures will result in the separatists - let us call them bandits - being forced to lay down arms."
Analysis: David Stern, BBC News, Kiev
On Saturday morning, the insurgents abruptly abandoned two of their main bases of operations, cities which they triumphantly overran three months ago and have maintained as a symbol of their dominance in Ukraine's east.
The question that no-one can answer right now, however, is whether this in fact constitutes a turning point in the conflict.
The rebels still seem to have large numbers in their ranks, and significant stores of weapons and military hardware. They continue to control a decent amount of territory in the east, though this apparently has been circumscribed somewhat in recent days.
They say they are motivated and will fight to the last man.
Nevertheless, there are indications that the fall of Sloviansk may indeed have been a watershed moment.
At the rally in central Donetsk, separatist fighters were cheered by thousands of supporters waving the flags of Russia and of the self-proclaimed Donetsk People's Republic.
Many called on Russian President Vladimir Putin to come to their aid.
Correspondents said armed fighters from Sloviansk could be seen walking through Donetsk on Sunday, many still wearing military camouflage.
Pavel Gubarev, the self-proclaimed governor of the Donetsk People's Republic, told the crowd: "We will begin a real partisan war around the whole perimeter of Donetsk. We will drown these wretches in blood."
In another development, Ukraine's prison service chief said rebels had attacked and destroyed the prison guard's headquarters in Donetsk in a bid to seize weapons. Serhiy Starenkyy told Interfax-Ukraine news agency that staff had been evacuated.
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