KYIV, Ukraine (AP) — More than 100,000 demonstrators calling for the authoritarian president of Belarus to resign marched through the capital of Minsk yesterday, as the daily protests that have gripped the nation entered their sixth week.

Many in the crowd, which the human rights group Viasna estimated as numbering more than 150,000, carried placards critical of Russia, reflecting concerns about President Alexander Lukashenko’s planned meeting today with Russian President Vladimir Putin.

It would be their first face-to-face contact since the unrest broke out in Belarus after the August 9 presidential election that officials say gave Lukashenko a sixth term with 80 per cent support. Protesters and some poll workers say the results were rigged.

Putin has said he stands ready to send Russian police into Belarus if the protests turn violent, stoking fears that Moscow could use the political dissent as an excuse to annex its neighbour like it did in Crimea in 2014.

The countries have a union agreement envisaging close political, economic and military ties, although Lukashenko has repeatedly expressed concerns that Putin wants Russia to absorb Belarus entirely.

Some observers believe Lukashenko is going into the meeting in a weak position, and that Putin may capitalise on this to try to ease him out of power.

“Lukashenko has not been able to show Putin that he is in control of the situation and has put out the flame of protest, and this may push the Kremlin to seek an alternative scenario and candidate,” independent political analyst Valery Karbalevich told The Associated Press.

Lukashenko has ruled the nation of 9.5 million people with an iron fist since 1994, harshly repressing the Opposition and the media.

But the protesters’ determination appears strong this time, despite daily detentions and reports of police beatings and abuse.

Interior Ministry spokeswoman Olga Chemodanova said about 250 people were detained yesterday in Minsk. She also said demonstrations took place in 16 other cities.

Police yesterday set up rows of barbed wire and prisoner transport vehicles, and deployed thousands of servicemen to block off the city centre from demonstrators. But protesters came together outside the centre and marched toward the presidential residence on the city’s outskirts.