major offensive action(Maj. Gen. Dmytro Marchenko, the commander of Ukraine’s forces in the region, recently acknowledged bubbling frustrations with the slow pace of Ukraine’s efforts to retake Kherson, but he said he could give no timetable for the start of major offensive actions.nytimes.comART Vancouver)
launch an attack(пример из Учебника военного перевода п/р проф. Л.Л. Нелюбина Военного изд-ва МО СССР, М.-1981: The battalion was assigned the mission to launch an attack at 010315 January.
Батальону была поставлена задача перейти в наступление 1 января в 3.15.solitaire)
shift from defense to offense(But these definitions do not encompass a decision to shift from defense to offense. When one nation attacks and the other only fights defensively, war already exists as a result of the attack and the defense – by Michael D. RamseyTamerlane)