Japan is to contribute $15.5m (£10m) to efforts to curb terrorism in the Middle East and Africa, Foreign Minister Fumio Kishida has announced as quoted by the BBC Monday.
The move follows the killing of two Japanese hostages by the militant group Islamic State.
The money, more than double an earlier pledge, will be used in part to help improve regional border controls.
PM Shinzo Abe has also previously committed $200m in non-military aid to the fight against Islamic State (IS).
National broadcaster NHK said the $15.5m was part of a new set of counter-terrorism measures due to be announced at a global security conference later this week in Washington DC.
Kishida said the new funding, to be distributed through international organizations, would go towards stepped-up border controls to prevent foreign fighters from joining extremist groups.