Meta Platforms, including Facebook, have removed a deepfake video of Ukrainian President Volodymyr Zelenskyy that had been circulating online.
The video appeared to show Mr Zelenskyy telling people to lay down their arms and go back to their families.
The video first appeared on the Ukrainian news website TV24 after the network was hacked by Russia.
The video showed the president standing on a podium addressing the people of Ukraine, telling them to surrender their arms as the country's defence had failed.
It said: "Dear Ukrainians! Dear defenders! Being president was not so easy. I have to make difficult decisions. At first, I decided to return Donbas. It's time to look in the eye. It didn't work out. It only got worse. Much worse. There is no more tomorrow."
While the voice of Mr Zelenskyy was difficult to distinguish from that of his real voice, the picture did appear to be quite pixilated.
However, thousands of people could have believed the video had it been a success.
President Zelenskyy later addressed claims that he had made the statement. He told people he certainly never said those things in an online video.
However, the deepfake managed to go viral on social media, which is why Meta took it down under its "manipulated media" policy.
Meta's head of Security Policy, Nathaniel Gleicher, said in a statement: "Earlier today, our teams identified and removed a deep fake video claiming to show President Zelensky issuing a statement he never did.
"It appeared on a reportedly compromised website and then started showing across the internet."
The Land Forces of Ukraine's Facebook page had previously explained that these videos could appear and seem real.
It said that fake videos can be "created through machine learning algorithms."
The page explained that sometimes such videos are so good they look very real, but in these cases, someone has put together a fake to "sow panic" among Ukrainian citizens.
The technical manipulation has sparked worries that the reality of situations in Ukraine could be extremely distorted to those under dictatorships.
The news comes after fears that Russia will invade other European countries were heightened after a senior researcher with the Finnish Institute of International Affairs accused the Kremlin of attempting to use anti-Russian sentiment to justify its war on Ukraine.
The Russian embassy in Helsinki has reportedly urged Russian citizens living in Finland to report any incidents of suspected discrimination, hate speech or violation of civil rights to them, reports Yle News.
The appeal for information was made through the embassy's social media accounts.
Jussi Lassila, a senior researcher at the Finnish Institute of International Affairs, told Yle the statement was an expected reaction.
He said: "Friends are scarce, and the information front has been completely lost. The moral support in the world is on the Ukrainian side, and there are no clear allies [for Russia]."
Since the beginning of the invasion almost four weeks ago, Russian speakers living in Finland have reported suffering from verbal and physical abuse due to their nationality.
Mr Lassila said it was expected for the Russian government to try and utilise any mistreatment of Russian citizens abroad to their advantage to sway the Russian people.
He added: "We must not go down this path. We must get as many Russians as possible against Putin and on the side of justice and truth, on the side of Ukraine and Europe."
Mr Lassila also urged Finnish people not to act out against Russian citizens as this would play into Putin's hand.
He said: "This whole catastrophe is the result of what happens when there is an authoritarian regime where the views and opinions of the citizens are not asked for or are considered irrelevant."
Similar calls have been issued by other Russian embassies, such as in Moldova and Sweden.
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