Notwithstanding paragraph (2), Contracting Parties which are states that were constituent parts of the former Union of Soviet Socialist Republics may provide in agreements concluded between them that transfers of payments shall be made in the currencies of such Contracting Parties, provided that such agreements do not treat Investments in their Areas of Investors of other Contracting Parties less favourably than either Investments of Investors of the Contracting Parties which have entered into such agreements or Investments of Investors of any third state.