I. A. Mereminskiy IKI RAS, Moscow, Russia, A. S. Gorban IKI RAS, Moscow, Russia HSE University, Moscow, Russia, Yu. S. Klein HSE University, Moscow, Russia IKI RAS, Moscow, Russia, E. A. Ushakova HSE University, Moscow, Russia IKI RAS, Moscow, Russia, A. N. Semena IKI RAS, Moscow, Russia, A. A. Lutovinov IKI RAS, Moscow, Russia, A. Yu. Tkachenko IKI RAS, Moscow, Russia, S. V. Molkov IKI RAS, Moscow, Russia

Using the Mikhail Pavlinsky ART-XC onboard the SRG observatory we have detected, for the first time, X-ray pulsations with a period of ~106 s from the poorly-studied high-mass X-ray binary RX J0535.0-6700 located in the Large Magellanic Cloud (LMC), thus proving that the accretor is a neutron star with strong magnetic field. Pulsations with similar period were also found in archival archival data from Chandra and XMM-Newton telescopes. Using photometry from WISE we shown that the source demonstrate significant variability in IR during the last twenty years, which could be caused by a secular evolution of the decretion disk. This discovery makes RX J0535.0-6700 another member of the large family of X-ray pulsars with Be-type companions in the LMC.