Konstantinos (Costas) Isychos was alternative Minister of Defense of the Hellenic Republic in the first Syriza government in 2015 and co-president of Greek-Russian ministerial working group. He was a Syriza deputy at the Hellenic parliament, but resigned in protest to the government's not respecting the referendum results in August 2015. He later co-founded the Popular Unity party along with other ex-ministers and ex-members of the Syriza Party. Earlier he headed the department of international policy and defense at Syriza. Costas Isychos is currently deputy general secretary of international association Friends of Crimea. He served as Vice President of Federation of civil aviation trade unions in Athens, and Vice President of Athens Labor center. He studied political and economic sciences at York University in Toronto, Canada and in Havana, Cuba. Costas Isychos was born in Buenos Aires, Argentina, in a Greek family.