Development came a day after a mortar attack in Goma.
Says it is waiting for an explanation from Rwanda for the rebel attack.
President's office said the $40 million deployment will end March 31, 2014.
Mortar rounds fired in town as rebels battle gov't forces for 2nd day.
Tjostolv Moland was one of two Norwegians convicted of murder.
Mission known as "MONUSCO" is intended to disarm fighters in the volatile east.
M23 rebels have attacked army positions in Goma since mid-May.
Huamn Rights Watchs says support ongoing even as killings, rape occur.
Peace talks between government, army rebels stalled again last week.
Heavy conflict between the Congo army and M23 rebels resumed Monday morning.
