In 2003, he completed an internship in foreign policy and improving English in the United States at the American Language Communication Center.

He was engaged in entrepreneurial activity in the 2000s before going back to the diplomatic sphere in 2009 to become the Ambassador of Slovakia in Russia, a position he served in until 2014.

[3][4] One of the attendees of the 2020 Minsk Victory Day Parade was Migaš, being one of the few foreign ambassadors in attendance.

He made his explanation one of principled stance, simply stating that he is the "son of a partisan and anti-fascist".

[6] In a meeting with Serbian ambassador Veljko Kovacevic on 28 May, President Alexander Lukashenko criticized the Slovak government on the move, saying that "frankly speaking, I do not fully understand the position of the official Slovak leadership which allegedly criticized his action".