break through (someone's) defenses

Translations
пробить чью-либо защиту
The negotiator was able to break through their defenses and reach an agreement.
Переговорщик смог пробить их защиту и достичь соглашения.
Definitions
To overcome or penetrate someone's physical, emotional, or psychological barriers, making them vulnerable or receptive to influence, persuasion, or attack.
Words
defense

noun
защита
break

verb
ломать
break through

verb
прорваться