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We present the results of optical identifications and spectroscopic redshiftsmeasurements for galaxy clusters from 2-nd Planck catalogue ofSunyaev-Zeldovich sources (PSZ2), located at high redshifts, $z\approx0.7-0.9$.We used the data of optical observations obtained with Russian-Turkish 1.5-mtelescope (RTT150), Sayan observatory 1.6-m telescope, Calar Alto 3.5-mtelescope and 6-m SAO RAS telescope (Bolshoi Teleskop Alt-azimutalnyi, BTA).Spectroscopic redshift measurements were obtained for seven galaxy clusters,including one cluster, PSZ2 G126.57+51.61, from the cosmological sample of PSZ2catalogue. In central regions of two clusters, PSZ2 G069.39+68.05 and PSZ2G087.39-34.58, the strong gravitationally lensed background galaxies are found,one of them at redshift $z=4.262$. The data presented below roughly double thenumber of known galaxy clusters in the second Planck catalogue ofSunyaev-Zeldovich sources at high redshifts, $z\approx0.8$.

Optical identifications of high-redshift galaxy clusters from Planck Sunyaev-Zeldovich survey