Yes, through UKKO.fi you can also send invoices to abroad. All invoices going abroad are issued in English.
Making an invoice for a company that's working abroad is possible through our normal invoicing system. In addition to filling out the usual information, you must also include a "VAT-number" of the client/company you are sending the invoice to. You must check the correct VAT-number before sending out the invoice. You can check the validity of a VAT-number from the European Comission page and from vero.fi