Ryan spoke at a news conference with Estonian Prime Minister Juri Ratas in Tallinn, the Estonian capital, during a visit by a bipartisan congressional delegation to the Baltic NATO member and staunch Washington ally.
While the Republican speaker claimed that Russia's alleged meddling didn't affect the outcome of the election won by US President Donald Trump he said its actions "cannot be tolerated."
He stressed the US has a responsibility to share the results of the Russia investigation with countries like Estonia, which in recent years has faced aggressive Russian disinformation campaigns along with Baltic neighbors Latvia and Lithuania.
"What we're doing through our investigation process is to figure out exactly what is it they did and how they did it so that we can help, equip and assist our allies to prevent the same kind of thing happening to them," Ryan said.
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"We're here to say thank you for meeting that pledge," Ryan said.
Estonia's relations with neighboring Russia have remained cold and uneasy since the former Soviet republic gained independence in 1991. Among other things, bilateral ties have suffered due to Estonia's success at catching spies working for Moscow.
Ryan was meeting with Estonian President Kersti Kaljulaid later today with his eight-lawmaker delegation. Estonia was the last stop in the delegation's European tour, which also included visits to Britain, Norway and Poland.