Ukrainian soldier killed as tensions with Russia soar
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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.
In his New Year's Eve address, Zelensky said ending the war in the east remains his "main goal".
"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.
The army gave no further details of how the soldier was killed.
The West has accused the Kremlin of planning an invasion.
This week, Biden held his second phone call with Putin in just over three weeks, threatening Moscow with major economic sanctions should it launch an attack.
The Russian leader said anti-Moscow sanctions would be a "colossal mistake".
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.
Kiev has been battling a pro-Moscow insurgency in two breakaway regions bordering Russia since 2014, when the Kremlin annexed Ukraine’s Crimean peninsula.