Romania:
republic
Russia:
federation
Rwanda:
republic; presidential, multiparty system
Saint Helena:
NA
Saint Kitts and Nevis:
constitutional monarchy with
Westminster-style parliament
Saint Lucia:
Westminster-style parliamentary democracy
Saint Pierre and Miquelon:
NA
Saint Vincent and the Grenadines: parliamentary democracy; independent sovereign state within the Commonwealth
Samoa:
constitutional monarchy under native chief
San Marino:
independent republic