The notion of a living wage internationally, again, is a fairly well-established international norm. The International Labour Organization does work on these issues and indeed consults regularly with states about appropriate levels of minimum wage, the issue you raised. Obviously a minimum wage is going to depend upon the particular economy you're speaking about, but it's absolutely possible to both require countries to have a minimum wage and require that the minimum wage be enforced.
On October 17th, 2006. See this statement in context.