[en] The PHENIX experiment at RHIC has measured invariant transverse momentum (p_T) spectra and nuclear modification factor (R_AB) of strange mesons K^*0 and K⁰_S, in p+p, d+Au and Cu+Cu collisions at center of mass energy 200 GeV. The p_T range of these measurements spans from 1.1 to 8.5 GeV/c for K^*0 and from 2 to 13 GeV/c for K⁰_S. Similar to the other light-quark mesons measurements, both these strange mesons show no cold-nuclear- matter effects in the measured p_T range in d+Au collisions. The nuclear modification factor for d+Au (R_dAu) ≈ 1 and is almost constant as a function of p_T. In case of Cu+Cu peripheral collisions, no suppression is registered with respect to the p+p yields scaled with number of binary collisions. In central Cu+Cu collisions, both mesons suffer substantial amount of suppression at high p_T (> 5 GeV/c), which is similar to the suppression suffered by light-quark mesons. In the intermediate p_T range (2 < p_T < 5 (GeV/c)), the strange mesons are less suppressed than light-quark mesons (π⁰) and more suppressed than baryons (p, p). (paper)