Currently, the ranking system of Sambo is the Master of Sport system, used for all sports in USSR and some countries in the Eastern Bloc.
MoS (Master of Sport) title is awarded, based on medaling in national and international competitions.
It is also tied with social security plan, allowing for athletes to compete and retire with a pension.
Now, the pension is estimated by military and LEO ranks, so when one athlete wins the national championship, he gets military rank as well. And he gets military pension, according to that rank.
No such system exists outside of the above mentioned countries and that is why FIAS now introduced new, color belt system, so the ranking around the world will be the same.
Because if not, then USA (for example) can have thousands of practitioners, who will never get their respective ranking (its impossible to implement MoS in USA or anywhere else, outside of the Eastern Bloc).
And since Sambo is now an Olympic sport, shooting for hosting the first Sambo Olympic competition in Paris 2024, the new system must be in place by then.
Why?
Because IOC has certain criteria and regulations for all Olympic sports.
FIAS is now clearing all of them and introducing minor changes.
New belt colors are same as in Judo, but will be worn as belt patches similar to the red part of the BJJ BB.