According to the report: Russia tried to help Trump, Iran tried to hurt Trump, and China chose not to attempt to interfere.
Russia and Iran tried to interfere with 2020 election, US intel agencies say (cnbc.com)
But the report said that Russian President Vladimir Putin authorized “influence operations aimed at denigrating President Biden’s candidacy and the Democratic Party, supporting former President Trump, undermining public confidence in the electoral process, and exacerbating sociopolitical divisions in the US.”
Iran, meanwhile, “carried out a multi-pronged covert influence campaign intended to undercut former President Trump’s reelection prospects—though without directly promoting his rivals—undermine public confidence in the electoral process and US institutions, and sow division and exacerbate societal tensions in the US,”
Intelligence experts also found that China, which
was previously thought to be expanding its U.S. influence efforts, ultimately did not deploy operations to affect the outcome of the Trump-Biden election.