Russia has secretly sent at least $300 million to foreign political parties and candidates in more than two dozen countries since 2014 in a bid to gain influence, a declassified U.S. intelligence assessment said on Tuesday.

US intelligence “estimates that these are minimum numbers and that in cases that have gone undetected, Russia likely covertly transferred additional funds,” a senior administration official said.

“We believe this is just the tip of the iceberg,” the official told reporters on condition of anonymity.

US intelligence has not released information about specific countries. Earlier, US officials have pointed to Bosnia and Ecuador as countries where Russia has directly intervened through its financial clout.

In one of the most egregious cases cited in the new assessment, US intelligence said the Russian ambassador to an unnamed Asian country provided millions of dollars to a presidential candidate.

In Europe, Russia has used fictitious contracts and shell companies to fund parties, while its state-owned companies have channeled covert funding directly to Central America, Asia, the Middle East and North Africa, the assessment said.

Russia has at times sent cash, but has also made use of cryptocurrencies and “generous” gifts, the assessment said.

President Joe Biden’s administration called for the assessment following Russia’s February 24 invasion of Ukraine, which led to a major US effort to isolate Moscow and arm Kyiv.

The government official said US diplomats shared their findings with governments in more than 100 nations.

The official described the effort as part of Biden’s Summit of Democracies initiative, launched after defeating Donald Trump.

The new assessment didn’t cover US domestic politics, but previously US intelligence said Moscow interfered in the 2016 election, specifically by manipulating social media to support Trump, who expressed his admiration for Russian President Vladimir Putin has expressed.

“The United States is working hard to address our vulnerabilities, and we encourage other countries to do the same,” the official said.

A demarche, or internal statement, by the State Department to US missions around the world says Russia conducted the covert campaign to change the foreign environment in its favor.

“For Russia, ‘covert political financing’ has two benefits: developing influence over favored individuals and parties, and increasing the likelihood that those parties will do well in elections,” it said.

“The hidden ties between these parties and their Russian benefactors undermine the integrity and public trust in democratic institutions,” it said.

Russian officials have long ridiculed US allegations of meddling, noting that the CIA has long supported coups in countries like Iran and Chile.

Putin is said to have been furious in 2011 when the United States pledged moral support to protesters across Russia who accused vote-rigging.

The US official dismissed any comparison between Russia’s alleged efforts and contemporary US practices such as funding election observers and non-state pro-democracy groups.

The US aid is transparent and “we do not support any particular party or candidate,” the official said.

“It’s about democratic governance and trying to help our other democracies strengthen democratic governance.”