fortifying russian
ока́пывающий
entrenching, digging trenches, fortifying with earthworks
укрепля́вший
strengthening (having strengthened), fortifying (having fortified)
укрепля́вшийся
strengthening (itself), fortifying (itself), that was strengthening, that was fortifying
укрепля́ющий
strengthening, reinforcing, fortifying, consolidating
упрочня́вший
strengthening, reinforcing, fortifying


















