On 7 May 2023, Ružić announced his resignation as Minister of Education and was officially dismissed by the National Assembly on 29 May.

In September 2013, after the reconstruction of the cabinet of Ivica Dačić, he was named the Minister without portfolio in charge of European integration and stayed on that position until 27 April 2014.

[2] In February 2017, the Prime Minister of Serbia Aleksandar Vučić decided to run for the 2017 Serbian presidential elections.

[5] On 29 June 2017, the cabinet of Ana Brnabić was formed,[6][7] with Ružić being named the Minister of Public Administration and Local Self-Government.

[8] Numerous opposition parties called for his resignation, including the Youth Initiative for Human Rights, and the Independent Union of Educators of Serbia.