The UK will sign new agreements with western Balkan countries to tackle people-smuggling gangs, as part of efforts to bring down small boat crossings.
The deals will increase intelligence sharing and cooperation with Serbia, North Macedonia and Kosovo to intercept and arrest the gangs, with the aim of breaking their business models at source.
The government said the region was a key route used by those who end up in the European Union or UK illegally, with almost 100,000 migrants transiting through the western Balkans last year.
Prime Minister Sir Keir Starmer will announce the plans at a meeting of the European Political Community (EPC) in Hungarian capital Budapest on Thursday.