South Korean stocks rose nearly 3 percent Tuesday to inch toward the 6,000-point mark on hopes for renewed negotiations between Washington and Tehran. The local currency sharply gained against the US dollar. The benchmark Korea Composite Stock Price Index added 159.13 points, or 2.74 percent, to close at 5,967.75, after reaching as high as 6,026,52. The index swerved over and under the 6,000-point mark, marking the first such move since March 3, when the index traded at 6,180.45, the first tradi