Iran and Russia are negotiating an oil-for-goods swap worth $1.5 billion a month that would let Iran lift oil exports substantially, in defiance of Western sanctions that helped force Tehran to agree a preliminary deal to end 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. "Good progress is being made at the moment with strong chances of success," said a Russian source. "We are discussing the...