Recently, for the first time, the BESIII Collaboration reported the strange hidden charm tetraquark states Zcs(3985) − in the K+ recoil-mass spectrum near the D−sD*0/D*−sD0 mass thresholds in the processes of e+e− → K+(D−sD*0+D*−sD0) at √s = 4.681 GeV (M. Ablikim et al., arXiv:2011.07855). The significance was estimated to be 5.3σ. We show that the newly observed Zcs(3985) − state is the U -spin partner of Zc(3900) − as a resonance within coupled-channel calculation in the SU(3)F symmetry and heavy quark spin symmetry (HQSS). In the SU(3)F symmetry, we introduce the GU/V parity to construct the flavor wave functions of the Zcs states. In a unified framework, we consider the J/ψπ(K), ¯D(s)D∗/¯D∗(s)D coupled-channel effect with the contact interaction. With the masses and widths of Zc(3900) and Zc(4020), we determine all the unknown coupling constants. We obtain mass and width of Zcs(3985) in good agreement with the experimental results, which strongly support the Zcs states as the U/V-spin partner states of the charged Zc(3900). We also calculate the ratio of the partial decay widths of Zcs(3985), which implies that the ¯DsD∗/¯D∗sD decay modes are dominant. We also predict the Zcs states with a mass around 4130 MeV and width around 30 MeV, which are the U/V-spin partner states of the charged Zc(4020) and HQSS partner states of the Zcs(3985). In the hidden bottom sector, we predict the strange tetraquark states Zbs and Z′bs with a mass around 10700 and 10750 MeV, which are the U/V-spin partner states of Zb(10610) ± and Zb(10650) ±, respectively.