1. In all cases before a Chamber or the Grand Chamber, a High Contracting Party one of whose nationals is an applicant shall have the right to submit written comments and to take part in hearings.

  2. The President of the Court may, in the interest of the proper administration of justice, invite any High Contracting Party which is not a party to the proceedings or any person concerned who is not the applicant to submit written comments or take part in hearings.

  3. In all cases before a Chamber or the Grand Chamber, the Council of Europe Commissioner for Human Rights may submit written comments and take part in hearings.