sabotage (someone's) plans

Translations
саботировать (чьи-то) планы
They attempted to sabotage his plans for the new project.
Они пытались саботировать его планы на новый проект.
Definitions
To deliberately disrupt or undermine someone's intended actions or strategies, often with the goal of preventing them from achieving their objectives.
Words
plan

noun
план
sabotage

verb
саботировать