By VANESSA GERA, NICOLE WINFIELD and LISA MASCARO WARSAW, Poland (AP) — A top-level U.S. congressional delegation led by House Speaker Nancy Pelosi praised the “ferocity” and resolve of Ukrainians face to face with their leader in a weekend visit to Kyiv undertaken in extraordinary secrecy. Pelosi, second in line to the presidency after the vice president, was the most senior American lawmaker to visit