Ukraine's government announced on Saturday that it has recaptured the country's Eastern city of Slavyansk. It represented the largest military stronghold for pro-Russian separatists.
Officials said that government troops intensified their offensive against the pro-Russian militants.
After regaining control of Slavyansk, President Poroshenko ordered that Ukraine's flag be flown at the administrative headquarters.
Pro-Russian separatists admitted that they have withdrawn from the city.
President Poroshenko presented a peace plan on June 20th. It included a ceasefire proposal in an effort to establish a relief program.
The military situation in Eastern Ukraine remains uncertain. The government admits that sporadic fighting is ongoing in Slavyansk and neighboring areas.
Pro-Russian militants say they were not defeated and will continue fighting in other parts of Eastern Ukraine.
Ukrainian says his country is ready for a new ceasefire with if certain conditions are met.
In telephone talks with US Vice President Joe Biden on Thursday, Poroshenko said he is ready to return to a ceasefire and engage in political dialogue with the separatists.
Jul. 5, 2014 - Updated 20:31 UTC