"Four years ago, Ukrainians from all walks of life and all regions of the country came together on the Maydan, Kyiv's central square, to demand their government recognize the choice of the citizens of Ukraine to join Europe. Scores of Ukrainians—the “Heavenly Hundred”—gave their lives on the Maydan for the dream of a better Ukraine," the Spokesperson for the U.S. Department of State, Heather Nauert, said in a statement on the occasion of the fourth anniversary of Ukraine's Revolution of Dignity.

"The United States will continue to stand by Ukraine as it faces ongoing Russian aggression, which has claimed over 10,000 lives and displaced more than 1.6 million Ukrainians," the statement reads.

Read alsoU.S. ready to help stop war in Donbas - VolkerNoting the important steps Ukraine has taken over the past four years, the U.S. diplomats believe "there is still more work needed to fulfill the promise of the Maydan and unlock Ukraine’s potential."

The United States has called on Ukraine’s leaders "to redouble their efforts to implement the deep, comprehensive and timely reforms that are necessary to build the stable, democratic, prosperous, and free country Ukrainians deserve."

"We are proud to work with the people of Ukraine to honor the sacrifices made four years ago for Ukraine’s European choice," said Heather Nauert.