reports Each report required by subsection (a) shall be submitted in unclassified form but may include a classified annex. (d) Interim briefings During periods between the submission of reports under subsection (a), the Secretary of State shall brief the appropriate congressional committees on any significant updates on the status and welfare of any United States citizens detained by the Government of the Democratic People's Republic of Korea. 304. Report and strategy relating to use of rocket fuels for ballistic missiles by the Democratic People's Republic of Korea (a) Report required (1) In general Not later than 90 days after the date of the enactment of this Act, and every 90 days thereafter, the Director of National Intelligence, in conjunction with the Secretary of State, shall submit to the appropriate congressional committees a report on the use by the Democratic People's Republic of Korea of unsymmetrical dimethyl hydrazine and other rocket fuels to power its ballistic missiles. (2) Elements Each report required by paragraph (1) shall include the following: (A) An assessment of each type of rocket fuel the Democratic People's Republic of Korea uses, or potentially may use, to power its ballistic missiles, including the chemical precursors, production process, and required production equipment for each such type of rocket fuel. (B) With respect to each such type of rocket fuel, an assessment of the following: (i) Whether the use of that type of rocket fuel by the Democratic People's Republic of Korea is prohibited under United Nations Security Council resolutions, other multilateral sanctions imposed on the Democratic People's Republic of Korea, or sanctions imposed by the United States with respect to the Democratic People's Republic of Korea. (ii) Whether the Democratic People's Republic of Korea imports that type of rocket fuel as a finished product or imports chemical precursors and manufactures the finished product. (iii) The countries from which the Democratic People's Republic of Korea imports