the Secretary of State, following consultation with the Committees on Appropriations and subject to the regular notification procedures of such Committees, may use the funds appropriated under this heading to procure defense articles and services to enhance the capacity of foreign security forces: Provided further , That of the funds appropriated under this heading, not less than $3,100,000,000 shall be available for grants only for Israel which shall be disbursed within 30 days of enactment of this Act: Provided further , That to the extent that the Government of Israel requests that funds be used for such purposes, grants made available for Israel under this heading shall, as agreed by the United States and Israel, be available for advanced weapons systems, of which not less than $815,300,000 shall be available for the procurement in Israel of defense articles and defense services, including research and development: Provided further , That funds appropriated or otherwise made available under this heading shall be nonrepayable notwithstanding any requirement in section 23 of the Arms Export Control Act: Provided further , That funds made available under this heading shall be obligated upon apportionment in accordance with paragraph (5)(C) of section 1501(a) of title 31, United States Code. None of the funds made available under this heading shall be available to finance the procurement of defense articles, defense services, or design and construction services that are not sold by the United States Government under the Arms Export Control Act unless the foreign country proposing to make such procurement has first signed an agreement with the United States Government specifying the conditions under which such procurement may be financed with such funds: Provided , That all country and funding level increases in allocations shall be submitted through the regular notification procedures of section 7015 of this Act: Provided further, That funds made available under this heading may be used, notwithstanding any