The United States is circulating a draft of new, tougher sanctions against Iran that concentrate on the banking, shipping and insurance sectors of Iran’s economy and is now waiting for China and Russia to signal that they are willing to start negotiating over the measures, United Nations Security Council diplomats said Wednesday.  The proposed sanctions would both broaden the scope and intensify three previous rounds of sanctions enacted since 2006 in an effort to persuade Iran to halt uranium enrichment and negotiate the future of its nuclear development program.  The diplomats said the proposed sanctions called for an outright ban on certain transactions with Iran, whereas the existing sanctions called on United Nations members to exercise “vigilance” or “restraint” in interacting with Iran in some areas of weapons trade, shipping and banking. The focus is on the Islamic Revolutionary Guards Corps, which runs a vast array of Iranian businesses, while the oil industry is not included, diplomats said.  The proposed sanctions seek to expand other aspects of those already in place, including the list of banks singled out, adding at least the country’s central bank to Bank Melli and Bank Saderat, which were listed before.  The new sanctions would also expand the list of individuals facing a travel ban and assets freeze for their work in the nuclear program. Sanctions to date, which run to about six pages, have singled out companies and individuals involved in the nuclear and missile development programs or in efforts to help to finance them. They include a ban on arms exports. – New York Times