Head of the Ukrainian President's Office Andriy Yermak and U.S. National Security Advisor Jake Sullivan have discussed security challenges around Ukraine.
According to Ukrinform, Yermak wrote about this on Twitter.
"In continuation of the ongoing dialogue, a substantive conversation with Jake Sullivan. About security challenges around Ukraine. About the domestic political situation in Ukraine. We continue to work together. De-escalation through diplomacy and active cooperation to strengthen our defense capabilities," Yermak said.