Three years ago, support for members of a Ukrainian political party that advocated closer ties with President Vladimir V. Putin of Russia plunged to near zero after Russian forces invaded Ukraine, flattening whole cities and killing tens of thousands of Ukrainians.

The party, called the Opposition Platform for Life, was banned, some members went to jail on charges of treason, and others fled Ukraine. A few former members banded together in a new faction and still sit in Parliament, but have generally kept quiet since the Russian invasion.

Now some of those pro-Russian politicians are attempting an unlikely comeback, inspired by President Trump’s attacks on Ukraine’s current leadership and Russian demands, echoed by Mr. Trump, that the country hold elections.

The politicians are posting widely viewed videos on social media in which they have promoted themselves as future candidates; criticized President Volodymyr Zelensky and his government; and praised Mr. Trump.

The efforts are unlikely to gain much traction in a country that remains overwhelmingly hostile to Russia and the people who have supported it. But analysts say the videos, which are rife with misinformation, could nonetheless stoke divisions at a time when Ukraine’s unity and its leaders are under threat from a hostile Mr. Trump.

Oleksandr Dubinsky, a former member of Parliament, has produced videos promoting what he calls a pro-Trump and pro-peace agenda from prison, where is he serving time for treason. His videos place blame Ukraine’s leaders for the war, saying they are committing genocide against the Ukrainian people, an echo of Russian propaganda.