Ukraine's foreign ministry condemned "sham elections" being staged by Russia in occupied Ukrainian territories on Friday, saying they were "worthless" and would have no legal standing.
Russia is holding regional elections, including in four Ukrainian regions that it does not fully control - Donetsk, Luhansk, Zaporizhzhia and Kherson.
The ministry said in a statement that the elections taking place on Ukrainian territory "grossly violate the sovereignty and territorial integrity of Ukraine" as well as international law.
"Russia's sham elections in the temporarily occupied territories are null and void. They will not have any legal consequences and will not lead to a change in the status of the Ukrainian territories captured by the Russian army," it said.
Kyiv called on its international partners to denounce the votes and not to recognise the results.
US Secretary of State Antony Blinken on Thursday also described the voting in Russian-occupied areas of Ukraine as "sham elections" and said they were "illegitimate".
The Russian embassy in the US responded by saying on Friday that Washington was meddling in Russia's internal affairs.
Israel is demanding the release of all 50 hostages held in Gaza, Israeli public broadcaster Kan cited the prime minister's office as saying on Tuesday, as talks on a proposed deal envisaging a 60-day truce and release of half the hostages continue.
U.S. President Donald Trump said on Tuesday he hoped Vladimir Putin was going to "be good" and move forward toward ending the war in Ukraine, but conceded it was possible the Russian president doesn't want to make a deal.
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US President Donald Trump has told Volodymyr Zelenskyy that the US would help guarantee Ukraine's security in any deal to end Russia's war there, though the extent of any assistance was not immediately clear.