The decision was the latest move by the government to spurn international involvement in its political crisis. Relations between Burundi and the ICC have been deteriorating since the ICC chief prosecutor announced in April an investigation into political violence that has engulfed the country since President Pierre Nkurunziza's controversial decision to seek a third term in office.
Aid suspensions or sanctions could raise the price of isolation, but implementation will require coordination, an uncertain proposition.
The president and his supporters will move toward consolidating power, including through constitutional change.
Burundi may withdraw its contingent of troops from the AU Mission in Somalia.
Renewed insecurity would drive further forced migration above the hundreds of thousands already displaced.
