You need to be more specific...By Serbian constitution from 1888. and 2006. the ruler of Serbia is the leader of the army. So it was the king,or now president.
By elections
League of Communists of Serbia ended in 1990.
Socialist Party of Serbia was created on 1990-06-27.
Civil war
Kaiser Wilhelm II.
Kaiser William II
Kaiser William II
Saddam Hussein became leader of Iraq in the early 1970s, so Saddam was leader of Iraq in 1990.
The political scene in Serbia is very divided, so there is no true 'leader'. The current president of Serbia is Boris Tadic, and the Prime Minister is Mirko Cvetkovic.
Boris Tadich Борис Тадић (in Serbian)
Nina Kirsanova died in 1990, in Belgrade, Serbia, Yugoslavia.
Djordje Zivadinovic was born in February 1990, in Belgrade, Serbia.