MOSCOW — Candidates from the pro-Kremlin party United Russia won nearly all of the municipal and regional elections held across the country, according to results released on Monday, though analysts said the party’s success owed much to low voter turnout.

Officials were clearly relieved by the results, which came after a long decline in United Russia’s popularity and a rise in antigovernment activism. President Vladimir V. Putin said the party’s victory showed that Russians supported the current government.

“I consider this, after the presidential elections, to be one more serious step towards strengthening Russian statehood and the creation of conditions for energetic, effective development in the coming years,” he said on Monday during a visit to the Central Election Commission.

United Russia leaders said the elections on Sunday were a decisive failure for the year-old opposition movement, which had staked most of its hopes on a mayoral race in the Moscow suburb of Khimki, where there has been a bruising battle over government plans to build a highway through a local forest. Early results showed that Yevgenia Chirikova, one of the most recognizable protest leaders, had lost there to an incumbent from United Russia by a vote of 17 percent to 48 percent.