A communist politician during the interwar period, he joined the Yugoslav Partisans following the Axis invasion of Yugoslavia but defected to the Ustaše in mid-1941.

"[5] Miljković became the leader of an anti-Ustaše uprising of mostly Serb citizens on Petrova Gora following the establishment of the NDH.

He was named commander of Velika Kladuša following the communist capture of the town in February and became the leader of the Yugoslav Partisans in Cazin.

He objected when the committee was merged with the KPH headquarters in Bihać in September and was distanced from the regional communist leadership of northwestern Bosnia shortly afterwards.

[1] Having attained the rank of deputy commander, Miljković deserted the Partisans as the Bihać field battalion began retreating from Drvar towards Livno in February 1943.

Miljković's unit served under the 3rd Mountain Brigade of the Croatian Home Guard from June to September 1943 and was later incorporated into the 114th Jäger Division of the Wehrmacht.

Miljković won the support of a small circle of citizens of Velika Kladuša and local Islamic religious leaders.

[1] The Germans, Croatians, Chetniks, and Partisans all wished to reach their own individual agreements with Miljković due to the large size of his militia.

The Ustaše proposed that his forces align themselves with the NDH and form the Krajina Brigade, while the Partisans offered to accept Miljković into their ranks.

[12] Several authors assert that the post-war politician and businessman Fikret Abdić—who led the Autonomous Province of Western Bosnia during the Bosnian War—drew inspiration from him.