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The response of the ultrarelativistic particle with spin in a Schwarzschildfield to the gravitomagnetic components as measured by the comoving observer isinvestigated. The dependence of the particle's spin-orbit acceleration on theLorentz \gamma - factor and the spin orientation is studied. The concretecircular ultrarelativistic orbit of radius r=3m is considered as a partialsolution of the Mathisson-Papapetrou equations and as the correspondinghigh-energy quantum state of the Dirac particle. Numerical estimates forprotons and electrons near black holes are given. A tendency of gravitationaland electromagnetic interactions to approach in quantitative terms atultrarelativistic velocities is discussedComment: 16 page

Gravitational ultrarelativistic interaction of classical particles in the context of unification of interactions