President Petro Poroshenko defended his decision to resume military action, saying it was crucial to defend Ukraine's territorial integrity after a 10-day cease-fire failed to quell violence.
The EU-Ukraine trade pact that helped lead to the current crisis was signed today. Russia, antagonistic over the idea of closer Ukraine integration with Europe, warned of consequences.
A peace plan announced by Ukraine's president earlier this week may not get off the ground, as fighting continued with pro-Russian separatists in parts of the country's east.
Russian fighters are among the separatist forces battling Ukraine's poorly equipped military for control of eastern provinces. A pullback of Moscow's troops could defuse tensions with the West.