The RadioAstron Space VLBI mission utilizes the 10-m radio telescope on-board the dedicated Spektr-R spacecraft to observe cosmic radio sources with an unprecedented angular resolution at 92, 18, 6 and 1.3 cm. The longest baseline of the space-ground interferometer is about 350,000 km. I will briefly review basic parameters and capabilities of the space radio telescope Spektr-R and the RadioAstron interferometer. Science highlights of the mission will be presented. It includes exciting results on AGN, pulsars and interstellar scattering, cosmic masers.