The usd remains in your central bank control. Foreign exchange is not required for local help ,its used solely for buying imported goods.We get USD after international buyer buy our bond then the USD that we collect turn into our currency, Rupiah to provide financial help for the poor. Where do we put the USD ?? Will it be just gone ?
Unless its a investment in some project in your country by a foreign concern.
Then to buy local services or goods, your central government gives the fireign investor or his local partner equivalent local currency.