Lazanski was born in Karlovac, to a Slovene father who got assigned to Karlovac as a Yugoslav People's Army (JNA) officer and Serb mother, Lazanski completed primary school in the town of his birth. His paternal family is of Polish origin. His grandfather and uncle were killed in the Jasenovac concentration camp held by the Ustashe during World War II. During the war, his father, at the time a Royal Yugoslav Army officer, was held at Osnabruck as a prisoner of war. His father's best friend was Zoran Konstantinović (1920–2007). His father's job took the family to Trebinje where Lazanski went to gymnasium. He had military service in Bitola in 1977, in the 41st infantry division of JNA. Upon graduating he enrolled at the University of Zagreb's Faculty of Law and graduated.
Lazanski's first jobs in journalism were for the Vjesnik daily newspaper and the Danas and Start weekly news magazines in Zagreb. He is a writer of numerous books.
He reported from the scene of armed conflicts such as the Soviet–Afghan War, the Iran–Iraq War, the Lebanese Civil War, and the Gulf War. Furthermore, he managed to obtain exclusive interviews with some of the leading global military figures of the period such as US Army general Bernard W. Rogers in October 1982 (who at the time performed the role of NATO's Supreme Allied Commander Europe) as well as Soviet Army general Sergey Akhromeyev in December 1982 who was about to become a Marshal.
Other figures Lazanski interviewed included John Galvin, Warsaw Pact commander-in-chief Viktor Kulikov in 1986, Soviet Minister of Defense Dmitry Yazov in 1988, Soviet Navy commander-in-chief admiral Vladimir Chernavin, KGB chief general Vladimir Kryuchkov, Igor Radionov, Bennie L. Davis, Paul Sper, Crosbie E. Saint, Huntington Hardisty, Sir John Woodward, James Alan Abrahamson, Johan Jørgen Holst, Ferenc Kárpáti, Vasile Milea, Dobri Dzhurov, Shahnawaz Tanai, Maher Abdul Rashid, Helmut Willmann, Guido Venturoni, Joe Modise, Georg Meiring, etc.
While he was writing for different Balkan publications, Lazanski's articles were also published in the Greek newspaper Kathimerini and the Japanese newspapers Diamond Weekly and Securitarian.
Speaking in September 2014 about his methods of access to military officials on both sides of the Cold War, Lazanski said:
In February 1991 Lazanski took an offer from Politika to become their commentator and moved to Belgrade. He remained at the job until fall 1995.
He reported from the Yugoslav Wars (including the Ten-Day War, Croatian War, Bosnian War and Kosovo War) as well as the First Chechen War, Libyan Civil War, and Crimea Crisis. He has authored several books.
Regarding NATO exercises in the Baltic, Lazanski believes it to be part of an "anti-Russian hysteria" in the creation in the West, and that claims that Russia holds aggressive military plans for the Baltic, and at the same time NATO does not have these for Eastern Europe, is false.
Lazanski was interviewed in Boris Malagurski's documentary film The Weight of Chains 2 (2014). He has guested RTS's Upitnik, Oko, Srbija na vezi, Tako stoji stvari, TV lica, B92's Kažiprst, RTRS's Terorizam, svijet u strahu!, RTV Pink's Jutarnji program, Dobro Jutro, Emisija Pravac, Teška reč, and HRT's Otvoreno. He is a frequent guest on TV Happy's popular show Ćirilica ("Cyrillic") hosted by Milomir Marić. Lazanski is the host of Lazanski direktno on RTRS. He has authored two documentary films, Rat za Kosovo and Komandosi, and fronted several more.
On 4 March 2016, it was confirmed that he was a member of the electoral list of ministers to the National Assembly of Serbia as member of a group of independents in the coalition led by Aleksandar Vučić and the Serbian Progressive Party. Lazanski became a member of the Board on Defense and Internal Affairs, as chosen by the National Assembly by 22 June 2016.
Lazanski is related to former president of Republika Srpska Biljana Plavšić, his maternal grandmother and Plavšić's father being siblings (Lazanski's mother and Plavšić are cousins).
He is married to a Serbian woman from Belgrade, and has a son, Aleksandar (born 1990).Books
Jutarnja patrola [Morning Patrol] (1999)
Uvek postoji sutra [There is Always Tomorrow] (2000)
Bin Laden protiv Amerike [Bin Laden Against America] (2001)
Istina o Srpskoj [Truth about Srpska] (2001)
Komandosi [Commandos] (2002)
Borbeni avioni [Fighter Planes] (2002)
Hitler je pobedio [Hitler Won] (2003)
Vreme izdaje [Time of Betrayal] (2008)
Jugoslovenska narodna armija [Yugoslav People's Army], documentary
Rat za Kosmet/Rat za Kosovo [War for Kosovo], documentary
Komandosi [Commandos], documentary
Titova soba tajni [Tito's Secret Room] (2014), documentary, director
Dnevnik iz Sirije [Diary from Syria] (2015), documentary