, 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 7011 of this Act: Provided further, That funds made available under this heading may be used, notwithstanding any other provision of law, for demining, the clearance of unexploded ordnance, and related activities, and may include activities implemented through nongovernmental and international organizations: Provided further , That only those countries for which assistance was justified for the Foreign Military Sales Financing Program in the fiscal year 1989 congressional presentation for security assistance programs may utilize funds made available under this heading for 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: Provided further , That funds appropriated under this heading shall be expended at the minimum rate necessary to make timely payment for defense articles and services: Provided further , That up to $75,000,000 of the funds appropriated under this heading may be obligated for necessary expenses, including the purchase of passenger motor vehicles for replacement only for use outside of the United States, for the general costs of administering military assistance and sales, except that this limitation may