Addressing the European Parliament on Wednesday, Navalnaya accused Russian authorities, led by Putin, of having orchestrated her husband’s killing.
She said the murder had once again shown everyone that “Putin is capable of anything and that you cannot negotiate with him.”
She expressed concern that EU sanctions have not stopped Russia’s aggression in Ukraine.
Navalnaya called for more innovative ideas to defeat Putin’s regime.
'You, and all of us, must fight this criminal gang'
“If you really want to defeat Putin, you have to become an innovator," she said. "You can’t hurt Putin with another resolution or another set of sanctions that is no different from the previous ones."
She added: "You aren’t dealing with a politician but with a bloody mobster ... The most important thing is the people close to Putin, his friends, associates, and keepers of the mafia’s money ... You, and all of us, must fight this criminal gang.”
She told the European Parliament: “No diplomatic notes, but investigations into the financial machinations. Not statements of concern, but a search for mafia associates in your countries, for the discreet lawyers and financiers who are helping Putin and his friends to hide money.”
'Putin must answer for what he has done to my country'
She also told European lawmakers that "tens of millions of Russians" were "against Putin, against the war, against the evil he brings."
She stated: “Putin must answer for what he has done to my country. Putin must answer for what he has done to a neighbouring peaceful country. And Putin must answer for everything he has done to Alexei.”
Navalnaya said last week that she would continue her husband's fight for "a free Russia."
"I want to live in a free Russia, I want to build a free Russia," Navalnaya said in a video message released three days after her husband's death.
Poland's president, prime minister and top diplomat have paid tribute to Navalny, who died in an Arctic penal colony on February 16.
Russian authorities said Navalny died of natural causes.
(gs)
Source: europarl.europa.eu, IAR, PAP