"We aren't coming to kill you, but to convince you. But if you don't want to be convinced, we'll kill you," Pavel Gubarev said in a video.
Under Musk's peace deal, Crimea, a region Russia annexed in 2014, would formally become part of Russia.
The Russian president is "trying to shift to a stalemate," said one expert on Russian-Ukrainian relations.
The "immense" costs of taking on four separatists regions in Ukraine come as Russia begins to feel the effects of economic sanctions imposed by the West.
Retired U.S. Admiral James Stavridis said Putin can ramp up nuclear threats as he uses referendums as a base to claim occupied areas are no longer Ukraine.
Russia faced criticism last week at the United Nations General Assembly for its aggression in Ukraine.
"There is more escalation from Putin to come," retired Lieutenant General Robert Ashley told Newsweek.
Voting on referendums across Russian-held regions of Ukraine begins Friday as the U.N. shares evidence of war crimes committed in Ukraine.
Russia hopes to "expand the 'electoral base' of support" for the referendums using the minors' participation, the Security Service of Ukraine said.
Russian protesters are being threatened with punishments that include being drafted to fight against Ukraine.
In a rare televised address, Russian President Vladimir Putin announced mobilization and accused the West of engaging in nuclear blackmail. Ukraine's Volodymyr Zelensky has responded.
Ukraine's Donetsk and Luhansk oblasts, which are currently occupied by Russian forces, are set to hold referendums on joining Russia this week.
"Encroachment on the territory of Russia is a crime, the commission of which allows you to use all the forces of self-defense," Russia's former president said.
Gaston Browne, the prime minister of Antigua and Barbuda said "this is not an act of hostility," but "a final step to complete the circle of independence."
The HQ belonged to a pro-Kremlin group that was organizing referendums on joining Russia.
Citing a "security situation" in Kherson, a Kremlin-installed leader said a planned referendum on joining Russia has been "paused."
Kansas became the first state to put abortion on the ballot since the fall of Roe. Tuesday's vote was the first popular vote on the issue in nearly 50 years.
Queen Elizabeth II's sister had a home on Mustique and Prince William and Kate Middleton are reported to enjoy family holidays on the island.
The queen's visit to Scotland for Holyrood week comes as the country's first minister moves on with her bid to hold an independence referendum.
The Texas GOP's platform calls for a referendum so Texans can vote on "whether or not the State of Texas should reassert its status as an independent nation."
The Kherson region has been almost entirely under the control of Russian forces since the beginning of March, when it became the first major city to fall in the Ukraine war.
The claim that Finland will soon be joining the Transatlantic Alliance began spreading on social media on Saturday. But is it true?
Italians overwhelmingly voted to approve a constitutional amendment this week which reduces the number of lawmakers in both chambers of its national parliament by one-third.
The Swiss people took to the ballots on Sunday to decide whether or not to extend anti-racism rights to the LGBTQ community.
After two years of debate, New Zealand's parliament passed a legal euthanasia bill which the public will vote on during general elections in 2020.
Fifty-three percent of voters surveyed said they would now vote to remain in the European Union compared with 47 percent who wish to leave if they were given a new referendum.