Cosmos-2399 photo-reconnaissance satellite completed its mission on December 9, 2003. The spacecraft broke up, which seems to be a normal procedure for satellites of this type. U.S. Space Command reported twelve new fragments, which were assigned numbers from 28100 to 28111 (2003-035H to 2003-035U respectively). The fragment associated with the spacecraft itself (27856, 2003-035A) entered atmosphere shortly after the breakup.
Cosmos-2399 was a photoreconnaissance satellite of the Don/Orlets-1 type, launched on August 12, 2003 (see the archive). It was in operation for 119 days, which is normal for satellites of this type. The satellite experienced a breakup earlier during its mission (see the archive).