The two countries signed a memorandum of understanding to advance collaboration between their prosecutors' offices.
A recent agreement between BiH and EUROPOL will increase security in the Balkan nation.
The Union approved funding for a new project to fight organised crime and enhance border security.
Thousands of illegal immigrants use the Balkan countries as a stepping stone to move into EU member countries.
Police in Serbia and Bosnia and Herzegovina joined forces to arrest 15 individuals suspected of war crimes, showing the importance of regional co-operation.
Officials' involvement in organised crime raises the issue of cross-border security.
Serbia, Macedonia and Montenegro are joining an OSCE initiative that aims to increase the countries' abilities to fight organised crime and terrorism.
Experts laud police action, say terrorism financers and trainers should be arrested next.
Authorities intensify the fight against money laundering and narcotics trafficking.
Efforts by the authorities as well as the end of duty tariffs on car imports have had an impact.
Experts and officials said that the Karadzic verdict could help unify BiH.
The efforts coincide with government calls for lesser sentences but bigger fines.
Authorities in Kosovo and Bosnia and Herzegovina detain more people suspected of ties to violent extremist organisations.
ICTY chief prosecutor Serge Brammertz said the country's progress in dealing with war criminals is evident.
Officials said 13 million pre-paid cards are used in Romania and, apart from terrorism, they can be misused in a wide range of illegal activities.