Article 24 (4)

The provisions of this Treaty which accord most favoured nation treatment shall not oblige any Contracting Party to extend to the Investors of any other Contracting Party any preferential treatment:

(a) resulting from its membership of a free-trade area or customs union; or

(b) which is accorded by a bilateral or multilateral agreement concerning economic cooperation between states that were constituent parts of the former Union of Soviet Socialist Republics pending the establishment of their mutual economic relations on a definitive basis.

An Investment of an Investor referred to in Article 1(7)(a)(ii), of a Contracting Party which is not party to an EIA or a member of a free-trade area or a customs union, shall be entitled to treatment accorded under such EIA, free-trade area or customs union, provided that the Investment: 

(a) has its registered office, central administration or principal place of business in the Area of a party to that EIA or member of that free-trade area or customs union; or

(b) in case it only has its registered office in that Area, has an effective and Continuous link with the economy of one of the parties to that EIA or member of that free-trade area or customs union.