This is stated in a statement on the website of the U.S. Department of State.
"We deeply appreciate the friendship that we have developed over past 25 years of diplomatic relations. We highly appreciate your resistance to serious problems, including the Russia-led conflict in Donbas, Russian occupation and an attempt of Crimea’s annexation," reads a statements on the Independence Day of Ukraine.
Tillerson noted that despite the difficulties, the Ukrainian people showed determination in creating economic opportunities, fighting corruption and strengthening their democratic institutions.
"The United States is proud of having been a partner of Ukraine, and we continue to support your sovereignty, territorial integrity and democracy. May the coming year bring peace, prosperity, and progress to the people of Ukraine," the U.S. Secretary of State said.
As reported, the celebration on the Independence Day of Ukraine was attended by U.S. Secretary of Defense James Mattis. He also met with President of Ukraine Petro Poroshenko and Defense Minister Stepan Poltorak.