MINSK, Belarus – The landslide victory of President Lukashenko in Belarus’s presidential election was condemned yesterday by a broad range of Western governments and international organizations as the poisoned fruit of the state’s abuse of power.

“The March 19 presidential election did not meet the required international standards for free and fair elections,” Rep. Alcee Hastings, a Democrat of Florida, who chairs a 55-country transatlantic organization that monitors elections, the parliamentary assembly of the Organization for Security and Cooperation in Europe, said.

“Arbitrary use of state power and widespread detentions showed a disregard for the basic rights of freedom of assembly, association and expression,” Hastings said, “and raise doubts regarding the authorities’ willingness to tolerate political competition.”

Official figures show that Mr. Lukashenko, 51, received 82.6% of the vote, compared to 6% for his nearest rival, Alexander Milinkevich, a former physics professor. Mr. Milinkevich said that the president’s tally was “monstrously inflated.”

For the second night in a row, thousands of his supporters gathered on a central square in downtown Minsk to protest the result. Riot police deployed nearby have so far not intervened to disperse the protesters, despite a threat from Mr. Lukashenko last week that he would “wring the necks” of demonstrators.

When a French reporter asked him at a press conference yesterday what had come of his threat, Mr. Lukashenko, a former collective farm manager, said, “I see your neck is in place.”

Opposition leaders conceded that the size of the crowds, 10,000 Sunday night and somewhat fewer yesterday, was not enough to threaten the government.

Sergei Kalyakin, who headed Mr. Milinkevich’s campaign, said 100,000 people are needed if authorities are to “hear the voice of the people.” In a country where Mr. Lukashenko maintains solid support and where the galvanized opposition is mostly composed of students, that kind of public backlash is unlikely.

Opposition leaders hope that the election and its aftermath will seed a movement that eventually will present a real challenge to Mr. Lukashenko’s autocratic rule.

In what has now become a pattern in the former Soviet Union at election time, observers from other former Soviet republics, including Russia, and Western monitors on government-sponsored trips, said the vote was free and fair.

“There is full ground to believe that the elections complied with universally recognized standards,” the Russian Foreign Ministry said in a statement. “There are no doubts about their legitimacy. This is the opinion of a large group of election observers from Russia” and the Commonwealth of Independent States, a loose association of former Soviet republics.

President Putin sent Mr. Lukashenko a telegram congratulating him on his victory.

The disputed result is likely to further estrange Belarus from its Western neighbors. The European Union, which abuts Belarus, said it may expand a visa ban on senior leaders and officials from the country of 10 million.

“Some action is now very likely,” the E.U. External Relations commissioner, Benita Ferrero-Waldner, said yesterday.

A White House spokesman, Scott McClellan, said America will consider similar measures. “The United States does not accept the results of the election,” Mr. McClellan said on Air Force One en route to Cleveland. “The election campaign was conducted in a climate of fear. It included arrests and beatings and fraud. We applaud democrats in Belarus for their courage and peaceful stand to reclaim their freedom.”