MOSCOW  Thousands of Russians from the pro-Kremlin youth group Nashi gathered in front of the United States Embassy here on Sunday night carrying jack-o’-lanterns inked with the names of war victims and charging that the war in Georgia was part of an American plot to improve Senator John McCain’s electoral prospects.

As music by Johnny Cash and the Allman Brothers played from loudspeakers, a stream of young people climbed off buses that had carried them to Moscow from far-flung provincial capitals. They held the pumpkins aloft for a moment of silence as a deep bass thumped and carnival-style lights played on the embassy’s facade.

In a film projected on several large screens, an actor playing President Bush (though with a heavy Russian accent) delivered a speech in which he gloated over the United States’ control over world affairs. The film asserted that the United States orchestrated World Wars I and II so that the American economy could overtake Europe’s, carried out the Sept. 11 attacks to broaden government powers and planned to brand every person on the planet with the “mark of the beast,” as referred to in the Bible.

“When that will happen, we will totally control all humanity,” said the actor playing Mr. Bush, swigging a beer, as a picture of the globe in chains glowed behind him.