Ukraine's leaders marked the one-year anniversary of Ukraine's Euromaidan revolution not with celebration but as a somber occasion.Relatives of protesters killed in the clashes that led to the ouster of Moscow-backed president Viktor Yanukovych have yet to see justice.And the costs of revolution are adding up.Thousands have died in ongoing fighting with Russia-backed rebels in the east, a major challenge for Ukraine's new leaders, says Yuri Yakymenko with Kyiv's Razumkov Center.For the first time in the history of independent Ukraine we are in a state of war against the biggest aggressor, we can even say adversary. We should call it like it is.But most Ukrainians, like Euromaidan protester Valentina Bilan, say the sacrifice for a European future is worth it.We've elected a parliament. Let's hope that it will work. Everything will be fine in time. We will remember my words.I went through the Orange Revolution. The scariest thing after revolution is that people should not be disappointed.The fighting has drawn attention away from much needed economic and political reforms in Ukraine and Russia, as both economies are on a downward spiral.Russian Academy of Sciences' Yuri Pivovarov says President Vladimir Putin's expansion into Ukraine is also a threat to Russia's democratic achievements.