Russian troops pressed toward Ukraine's capital Saturday after a night of explosions and street fighting sent Kyiv residents seeking shelter underground. The country's leader refused an American offer to evacuate, insisting he would stay. “The fight is here,” President Volodymyr Zelenskyy said. Ukrainian officials reported some success in fending off assaults. Skirmishes reported on the edge of the city suggested that small Russian units were trying to clear a path for approaching forces, which a British official said “are still some way off.” Russia claims its assault on Ukraine is aimed only at military targets, but civilians have been killed and injured during Europe's largest ground war since World War II. A missile struck a high-rise apartment building in the city's southwestern outskirts near one of Kyiv's two passenger airports, Mayor Vitali Klitchsko said, leaving a jagged hole of ravaged apartments over several floors. A rescue worker said six civilians were injured. The mayor extended a 10 p.m.-7 a.m. curfew he imposed two days ago to run from 5 p.m. until 8 a.m. as of Saturday. “All civilians on the street during the curfew will be considered members of the enemy's sabotage and reconnaissance groups,” Klitschko said.