MOSCOW — The Baltic state of Latvia, governed since the 1991 collapse of the Soviet Union by political forces inclined toward Europe and wary of Russia, on Sunday became the latest country whiplashed by rising populism with the announcement of election results that showed strong support for pro-Russia and anti-establishment parties.

The results delivered a serious blow to mainstream politicians and opened the way for coalition talks that, for the first time, could lead to a government that includes Harmony Center, a Moscow-friendly party that until this year had a cooperation agreement with Russia’s governing party, United Russia.

Not only did Harmony win nearly 20 percent of the vote, the most in the parliamentary election held Saturday, but it was followed in second place by a new anti-establishment party. The party, KPV LV — Who Owns the State — is led by Artuss Kaimins, a flamboyant former actor turned unruly politician whose critics in Latvia deride him as “our Donald Trump.”

Public discontent with Latvia’s traditional parties has been fed in recent months by a series of scandals that have left the governor of the central bank under investigation for corruption and led to the collapse of ABLV, the country’s largest locally owned bank. The United States Treasury issued a report in February describing the bank as a sprawling, money-laundering enterprise.