KIEV, Ukraine (AP) — As riots spread from Ukraine’s embattled capital to nearly half of the country, President Viktor Yanukovych promised Friday to reshuffle his government and make other concessions — but a top opposition leader said nothing short of his resignation would do.

Hours after the president’s comments, huge fireballs lit up the night sky in central Kiev and plumes of thick black smoke rose from burning tires at giant barricades erected by protesters.