MOSCOW — Opposition to Russia’s intervention in Ukraine sparked an unexpectedly large protest march here Saturday, as tens of thousands of demonstrators waving Ukrainian, Russian and European Union flags chanted “No war!” and “Russia without Putin.” They wore armbands and ribbons in the Ukrainian colors of blue and yellow, ribbons in Russia’s white, blue and red, and the plain white ribbons that were a hallmark of the large rallies against President Vladimir Putin that blossomed and then faltered in 2012. “This is to show Ukrainian citizens our solidarity, so they will see there is another Russia, a Russia that doesn’t want war,” said Maria Lobanova, 30, who had come to the rally with her father, husband and two sons, ages 4 and 1.