Soviet fear of foreign influence gained momentum from sporadic ethnic guerilla uprisings along the entire Soviet frontier throughout the 1920s. The Soviet government was particularly concerned about the loyalty of the Finnish, Polish, and German populations. However, in July 1925 the Soviet authorities felt secure enough and in order to project Soviet influence outwards, exploiting cross-border ethnic ties, granted national minorities in the border regions more privileges and national rights than those in the central regions. This policy was implemented especially successfully in the Ukrainian SSR, which at first indeed succeeded in attracting the population of Polish Kresy. However, some Ukrainian communists claimed neighboring regions even from the Russian SFSR.