Iran and Russia are negotiating an oil-for-goods swap worth $1.5 billion a month that would let Iran increase oil exports substantially, undermining Western sanctions that helped persuade Tehran in November to accept a preliminary deal to curb its nuclear program. Russian and Iranian sources close to the barter negotiations said final details were in discussion for a deal that would see Moscow buy up to 500,000 barrels a day of Iranian oil in exchange for Russian equipment and goods, according to the Reuters news agency. “Good progress is being made at the moment with strong chances of success,” said a Russian source. “We are discussing the details, and the date of signing a deal depends on those details.” The Kremlin declined to comment. “Our desire is to sign the deal as soon as possible,” said a senior Iranian official, who declined to be named. “Our officials are discussing the matter […]