Ukraine's border guards service said anyone crossing in or out of rebel areas will now have to present a passport. Foreigners will "be sent to filtration points to determine the purpose of their visit" and will have "to show a passport or the required visa," a statement said.
The rule was explained as a security measure to seal off the separatist region in the east, where artillery fire violated a tattered ceasefire deal on multiple occasions early Thursday.
In another sign that Ukraine's government has given up regaining control of the east anytime soon, Prime Minister Arseniy Yatsenyuk said Wednesday that subsidies and social payments, including pensions, would be halted to rebel-controled areas.
The developments in Kiev came against a background of fierce shelling in Donetsk and other incidents that raised fears of a total breakdown in a peace plan signed in September.
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"We have to see clearly what is happening on the ground from now until then," she said.
Almost non-stop artillery fire rained down around the outskirts of Donetsk, where a shell had killed two teenagers yesterday while they were playing football.
Russia's investigative committee said it had opened a criminal case against Ukrainian forces over the incident, while Ukraine's military said a case had been opened against the separatists.