The government said it was opposed to meeting with "those who are supporting violence" in the opposition.
Violence has raged in the East African country since President Nkurunziza was re-elected in July.
A Refugees International report found 80 cases of alleged recruitment into a non-state Rwandan militia.
Twelve armed attackers were killed after besieging three military bases in and around Bujumbura.
The Public Security Minister and the Deputy Director of the National Police Force are among those facing sanction.
Burundi's postponed elections were held Tuesday despite protests at home and abroad.
Godefroid Niyombareh is reportedly staging a coup