The current study extends seminal work by Maria Polinsky on American Russian to other varieties of Russian acquired in contact with Norwegian and Hebrew. Two groups of child heritage language (HL) speakers of Russian participated in the study: Russian-Norwegian (n=17) and Russian-Hebrew (n=34). Their performance was compared to Russian-speaking monolingual children (n=79), evenly distributed across the four age groups: 3-, 4-, 5-, and 6-year-olds. We also tested a group of monolingual Russian-speaking adult controls. All participants performed the same picture-description task targeting Structural accusative, Inherent dative, and Lexical cases assigned by the prepositions na ‘on’, v ‘in’, and pod ‘under’, differentiating locative and directional semantics. The performance of monolingual Russian-speaking children was homogeneous and target-like with respect to the specified structures from age 3. Child HL-Russian speakers in both groups displayed more heterogeneous profiles. The data indicate that some HL speakers might develop systems that are qualitatively different from monolinguals, while others acquire a target-like case system. Possible reasons for such qualitative differences include substantially diminished input in the HL as well as potential cross-linguistic influence from the SLs. Theoretical implications of these findings are discussed.