CARACAS, Venezuela — President Nicolás Maduro of Venezuela warned Americans in a video posted on Wednesday that intervening in his country “would lead to a Vietnam worse than they can imagine.”

The video, posted on his social media accounts, came out on the same day Mr. Maduro gave an interview to Russia’s RIA news agency in which he seemed more conciliatory, saying he was open to talks with the country’s opposition but rejecting calls for a new election.

“I am ready to sit down at the negotiating table with the opposition,” Mr. Maduro said, naming Mexico, Uruguay, Bolivia and Russia among possible mediators, but giving no indication of having made progress in arranging the talks.

The United States last week recognized Venezuela’s opposition leader, Juan Guaidó, as the country’s acting president, as have 26 other countries.