Ukraine said Saturday one of its soldiers was killed in fighting with pro-Moscow separatists, as the US again warned Russia against any attacks on the country.
In his New Year’s Eve address, Mr Zelensky said ending the war in the east remains his “main goal”.
US President Joe Biden was due to speak to his Ukrainian counterpart Volodymyr Zelensky on Sunday, after warning Russian President Vladimir Putin for the second time of a tough response should he invade Ukraine.
“One serviceman of the Joint Forces was fatally wounded,” the army said in a statement, adding that separatists had launched three attacks within 24 hours, using grenade launchers and small arms.
Ukrainian reservists take part in exercises near Kiev on December 25, 2021.
The army gave no further details of how the soldier was killed. Tensions with Moscow have soared in recent months, with Russia massing troops near Ukraine’s borders.
The West has accused the Kremlin of planning an invasion.
This week, Mr Biden held his second phone call with Mr Putin in just over three weeks, threatening Moscow with major economic sanctions should it launch an attack.
Joe Biden speaks with Ukrainian counterpart Volodymyr Zelensky.
The soldier’s death on Saturday was the first since the truce was agreed. All previous ceasefires — including the previous truce agreed in July 2020 — crumbled.
The Russian leader said anti-Moscow sanctions would be a “colossal mistake”. On December 22 international monitors said Russia and Ukraine had agreed to restore a ceasefire, but as early as the next day Kiev and separatists accused each other of new violations.
The conflict in eastern Ukraine has so far left more than 13,000 dead.