7076 of this Act, shall include an estimate of all known credits currently attributable to the United States and provide updated assessment costs including offsets from available credits and updated foreign currency exchange rates: Provided further , That any payment of arrearages under this heading shall be directed to activities that are mutually agreed upon by the United States and the respective international organization and shall be subject to the regular notification procedures of the Committees on Appropriations: Provided further , That none of the funds appropriated under this heading shall be available for a United States contribution to an international organization for the United States share of interest costs made known to the United States Government by such organization for loans incurred on or after October 1, 1984, through external borrowings: Provided further , That funds appropriated under this heading are made available to pay not less than the full fiscal year 2019 United States assessment for each respective international organization. Contributions for international peacekeeping activities For necessary expenses to pay assessed and other expenses of international peacekeeping activities directed to the maintenance or restoration of international peace and security, $716,425,000, of which 15 percent shall remain available until September 30, 2020: Provided , That none of the funds made available by this Act shall be obligated or expended for any new or expanded United Nations peacekeeping mission unless, at least 15 days in advance of voting for such mission in the United Nations Security Council (or in an emergency as far in advance as is practicable), the Committees on Appropriations are notified of: (1) the estimated cost and duration of the mission, the objectives of the mission, the national interest that will be served, and the exit strategy