  Peculiar properties of the BFKL approach in the next-to-next-to-leading
logarithmic approximation (NNLLA) are discussed. In this approximation the
scheme of derivation of the BFKL equation must be changed because of violation
of the simple factorized form of amplitudes with multi-Reggeon exchanges and
necessity to take into account imaginary parts of amplitudes in the unitarity
relations.
