balance of power

noun
1
the way in which political or military strength is divided between two or more countries or groups
تعادل قدرت, موازنه قدرت, توازن قوا, موازنه قوا
2
the power held by a small group which can give its support to either of two larger and equally strong groups
موازنه قدرت, توازن قدرت, توازن قوا, موازنه قوا
With 18% of the votes, the Green Party now holds the balance of power in the national assembly.
Who holds the balance of power in this relationship?