Hi Irena, which are the China/Russia border immigration are open for foreign tourists to travel vice versa by road and/or rail. I was in Manzhouli last year but it was closed. Best regards
Automobile: «Starotsurukhaitui»; «Turiy Rog»; «Poltavka»
Rail: «Pogranichny»; «Khasan»; «Makhalino»; «Zabaikal’sk»