Voting began Friday in Moscow-held regions of Ukraine on referendums to become part of Russia, Russian-backed officials there said.
The Kremlin-orchestrated referendums, which have been widely denounced by Ukraine and the West as shams without any legal force, are seen as a step toward annexing the territories by Russia.
The votes are being held in the Luhansk, Kherson and partly Russian-controlled Zaporizhzhia and Donetsk regions.
The vote, which asks residents if they want their regions to be part of Russia, is certain to go Moscow's way. That would give Russia the pretext to claim that attempts by Ukrainian forces to regain control are attacks on Russia itself, dramatically escalating the seven-month war.
The referendums follow Russian President Vladimir Putin's order of a partial mobilization, which could add about 300,000 Russian troops to the fight. The balloting will continue for five days through Tuesday.
As the votes were getting underway in the occupied regions, Russian social media sites were full of dramatic scenes of tearful families bidding farewell to men departing from military mobilization centers. In cities across the vast country, men hugged their weeping family members before departing as part of the draft. Russian anti-war activists, in the meantime, planned more protests against the mobilization.
Election officials will be bringing ballots to people's homes and setting up makeshift polling stations near residential buildings during the first four days of the referendums, according to Russian-installed officials in the occupied regions, who cited safety reasons. Tuesday will be the only day when the voters will be invited to come to regular polls.
Polls also opened in Russia, where refugees from the occupied regions can cast their votes.
Denis Pushilin, separatist leader of Moscow-backed authorities in the Donetsk region, called the referendum on Friday "a historical milestone."
Vyacheslav Volodin, speaker of Russia's lower house of parliament, the State Duma, addressed the occupied regions Friday in an online statement, saying: "If you decide to become part of the Russian Federation — we will support you."
Valentina Matviyenko, chair of Russia's upper parliament house, said that residents of the occupied regions were voting for "life or death" at the referendums.
Ukrainian President Volodymyr Zelenskyy only briefly mentioned the "sham referenda" in his nightly address in which he switched from speaking in Ukrainian to Russian to directly tell Russian citizens they are being "thrown to their deaths."
"You are already accomplices in all these crimes, murders and torture of Ukrainians," he said. "Because you were silent. Because you are silent. And now it's time for you to choose. For men in Russia, this is a choice to die or live, to become a cripple or to preserve health. For women in Russia, the choice is to lose their husbands, sons, grandchildren forever, or still try to protect them from death, from war, from one person."
The voting takes place against the backdrop of incessant fighting in Ukraine, with Russian and Ukrainian forces exchanging fire as both sides refuse to concede ground.
On Friday morning, pro-Russia officials in the Zaporizhzhia region reported a loud blast in the center of Melitopol, a city that Moscow captured early on in the war. Official Vladimir Rogov didn't offer any details as to what caused the explosion and whether there was damage and casualties.
Moscow-backed authorities in the Donetsk region also accused Ukrainian forces of shelling the city of Donetsk, the region's capital, and the nearby city of Yasynuvata.
Ukrainian officials, in turn, reported new rounds of Russian shelling in various parts of the country. Vitaliy Kim, governor of the Mykolaiv region in southern Ukraine that borders the Kherson region, said explosions rang out in the city of Mykolaiv in the early hours of Friday.
Valentyn Reznichenko, governor of the Dnipropetrovsk region, said the Russians unleashed a barrage of shelling on Nikopol, a city across from the Dnieper River from the Zaporizhzhia nuclear power plant, on Friday morning.
Additional reporting by The Associated Press.