UNITED NATIONS, United States: The UN Security Council will vote Saturday on a US-drafted resolution toughening sanctions on North Korea, diplomats said, a proposed ban on certain exports that could deprive Pyongyang of $1 billion in annual revenue. After a month of negotiations, the United States reached a deal with China, North Korea’s main trading partner and ally, on the measures aimed at ratcheting up pressure on Pyongyang to halt its missile and nuclear tests. The Security Council was scheduled to vote at 3 p.m. (1900 GMT) Saturday on the new raft of sanctions, diplomats confirmed. The draft resolution calls for a ban on all exports of coal, iron and iron ore, lead and lead ore, as well as fish and seafood by the cash-starved state, according to the text seen by Agence France-Presse. If implemented by all countries, the ban would strip Pyongyang of roughly a third of its export earnings estimated at $3 billion per year, according to a diplomat familiar with the negotiations.