Sentence:  The Secretary of the Treasury , upon the concurrence of the Secretary of State , is authorized and directed , out of the sum covered into the Yugoslav Claims Fund pursuant to subsection ( b ) of this section , after completing the payments of such funds pursuant to subsection ( c ) of this section , to make payment of the balance of any sum remaining in such fund to the Government of the Federal People's Republic of Yugoslavia to the <WSD>extent</WSD> required under article 1 ( c ) of the Yugoslav Claims Agreement of 1948 . 
Meaning of the word marked with <WSD> tags:  the point or degree to which something extends