More than 1.3 million people have been displaced in less than a year, but Congo has received little in the way of aid.
President Kabila was due to step down in December 2016, but Congo failed to organize elections, leading to deadly protests.
Ex-soldier Joshua French was convicted of murder, attempted murder and espionage by a Congolese court.
Moise Katumbi, the chairman of Congo's premier football team and a presidential candidate, has not set foot in the country for a year.
Buying a passport in Congo costs $185, almost half a citizen's annual income.
President Joseph Kabila is due to step down when the next elections are held.
Etienne Tshisekedi, the longtime opposition leader, died in February.
Etienne Tshisekedi was the man with the experience to lead Congo to elections in 2017. After his death, they are in doubt.
The U.S. special envoy to the African Great Lakes, Tom Perriello, played an important role.
At least 34 people in Congo have been killed in protests since Monday, a human-rights researcher has claimed.
Violence broke out in the central Kasai province after a dispute between an uncle and nephew.
The majority want him to leave when his term ends in December, but he says elections will be delayed until 2018.
Joseph Kabila said he hopes 10 million more voters will now register for the 2018 election.