Kabuga's arrest marks the beginning of a long legal process in which the prosecution faces numerous challenges.
Between 1992 and 1994, the former regime is said to have imported 581 tonnes of machetes into Rwanda. This figure appears to establish that the genocide was planned. But is this number accurate?
Given the contested success of transitional justice in Rwanda, the arrest showcases the mixed record of international justice.
Though genocide survivors would ideally want Kabuga to be prosecuted in Rwanda, it won't be possible, for legal or political reasons.