The deputy head of Ukraine's National Security and Defense Council says government forces now intend to complete a "full blockade" of the separatist strongholds of Donetsk and Luhansk.
Mykhailo Koval said on July 7 that the blockade of the two eastern cities would be aimed at forcing the pro-Russian separatists to disarm.
The separatists said any attempts at a military blockade would destroy any hopes for a political solution.
The separatists have vowed to regroup in Donetsk and Luhansk after government forces retook Slovyansk, a major rebel stronghold.
Pavel Gubarev, the self-described governor of the self-declared Donetsk People's Republic, has threatened a "real partisan war around the whole perimeter of Donetsk."
On July 7, reports said three bridges on roads leading into Donetsk were destroyed by explosions, allegedly by separatists.