Head of the Ukrainian President's Office Andriy Yermak has had a telephone call with United States National Security Adviser Jake Sullivan, during which he asked the United States to play a more active role in settling the conflict in Donbas.

"The United States could play a more active role in promoting peace talks to put an end to the war in Donbas, the Ukrainian presidential press service said, citing Yermak on Monday evening.

Yermak briefed Sullivan on the security situation along the line of contact in Donbas. He said the past few weeks have seen a dangerous trend toward a higher number of ceasefire violations and fatalities. Yermak also informed Sullivan of the deaths of four Ukrainian soldiers in a mortar attack near Shumy in Donetsk region on March 26.

Yermak said that Ukraine remains "an outpost of the democratic world in eastern Europe and pays a high price for this, in particular, losing the lives of its best citizens."

At the same time, Yermak thanked the United States for a clear and consistent policy to support the sovereignty and territorial integrity of Ukraine, as well as for providing important security assistance in enhancing Ukraine's defense capability. In particular, for supporting the reform of the Armed Forces of Ukraine and strengthening the naval forces of the Armed Forces of Ukraine in Crimea.

"We appreciate the recent strong statements by President Joe Biden and your administration's representatives on Crimea. It is very important for us to confirm the U.S. policy regarding non-recognition of the attempt to annex Crimea, condemn the illegal occupation of the peninsula, as well as support our Crimean Platform initiative," the head of the President's Office said.

He also said that "owing to support from the United States, Ukraine has been recognized as NATO Enhanced Opportunities Partner and expects to be granted a Membership Action Plan."

In addition, Yermak told Sullivan about the reforms of the Ukrainian president. "The goal of the President of Ukraine is to build a modern democratic state based on rule of law, free from corruption and the influence of oligarchs," the official said.

He said that, on the initiative of Zelensky, "the Center for Countering Disinformation was created, the head of which will soon be presented to the public."

"The events that have taken place in recent years in Ukraine and in other countries prove that information warfare and the spread of disinformation are no less destructive than armed confrontation," Yermak said.

In turn, the adviser to the U.S. President stressed the importance of cooperation in countering disinformation.

"We have a lot to learn from you in countering disinformation. We hope for the possibility of further cooperation in this area," Sullivan said.

He also noted the efforts of Ukraine in conducting reforms. The adviser to the U.S. President said that Washington will help Kyiv achieve its political and economic security goals. Sullivan pledged his readiness to continue helping Ukraine to obtain full membership in NATO.