Bash file doesnt work when it is launched from ruby script, but works with the same entry manually

Question

I have a very strange situation. I have a command in some ruby script, which launches a bash file with some parameters.

It looks like this in ruby

 res=`/usr/bin/some-file #{script_options}`

And there is some strange behavior. If script_options includes some russian symbols, bash script doesn't working

But if I launch bash script manually from command line with exactly script-options, all works properly.

Do you have any ideas what it could be, or should I update this question and show some code examples?

EDIT

part of ruby code:

def restore_backup(id, options)
        script_options="#{id}"
        if options[:datastoreid]
            script_options="#{script_options} -d #{options[:datastoreid]}"
        end
        if options[:name]
            script_options="#{script_options} -n \"#{options[:name]}\""
        end

        err=0
        File.write('/opt/restore_script_opt', script_options)
        res=`/usr/bin/one-restorevm #{script_options}`
        if !$?.success?
            err=1
        end
        puts res
        return err
    end

So, this is how function defined. But if script_options contains some russian symbols like

18 -d 1 -n "лштнфум", bash script launched by this function doesn't work

If I run it from command line, like

one-restorevm 18 -d 1 -n "лштнфум"

all is working. Also, if the script is launched by this function with only English symbols - all is also working

Thank you