KYIV/MOSCOW (Reuters) - Exiled opposition figure Sviatlana Tsikhanouskaya on Sunday called on Belarusians to begin a nationwide strike after police forces loyal to veteran President Alexander Lukashenko fired stun grenades to disperse mass protests.ADVERTISEMENT: Your content will begin in 10 seconds Tsikhanouskaya had previously set a “People’s Ultimatum” for Lukashenko to resign by Sunday night, promising to call the strike if he did not. Lukashenko, who has ruled for more than a quarter of a century, has signalled he would ignore the ultimatum. “The regime once again showed Belarusians that force is the only thing it is capable of,” Tsikhanouskaya wrote in a statement. “That’s why tomorrow, Oct. 26, a national strike will begin.” It was not immediately clear how many Belarusians would answer her call. But in a show of opposition strength, tens of thousands marched through Minsk and other cities on the 11th straight weekend of mass protests since a disputed election. Police used stun grenades against protesters they headed towards Independence Palace in the capital. People carrying the red-and-white flags of the Belarusian opposition movement scattered as loud bangs and flashes lit up the city’s streets after nightfall, videos showed.