A working document was ultimately produced and signed by Smith, Wilson and Gibbs, to be accepted or rejected in its entirety by each Cabinet after the Prime Ministers returned home. Whitehall accepted the proposals, but Salisbury turned them down; Smith announced on 5 December 1966 that while he and his ministers were largely satisfied with the terms, the Cabinet did not feel it could responsibly abandon the 1965 constitution while so much uncertainty surrounded the transition and the new "mythical constitution yet to be evolved". Rhodesia's Leader of the Opposition Josiah Gondo promptly demanded Smith's resignation, reasoning that the Cabinet's rejection of the working document he had helped to draft amounted to a vote of no confidence. The RF ignored him. Warning that "grave actions must follow", Wilson took the Rhodesia problem to the United Nations, which proceeded to institute the first mandatory trade sanctions in its history with Security Council Resolutions 232 (December 1966) and 253 (April 1968). These measures required UN member states to prevent all trade and economic links with Rhodesia.