article_snippet: Chinese Foreign Minister Wang Yi sounded optimistic as Chinese Foreign Minister Wang Yi briefed reporters on the talks' progress earlier Monday, saying that the diplomats were "narrowing down" the diplomats differences and working out ways to resolve sticking points.
article_snippet: These marathon-like negotiations have reached the final stage," Chinese Foreign Minister Wang Yi said.
article_snippet: Things have been tense in Lausanne as the deadline for an agreement looms, with talks snagged on three important points: .
article_snippet: Aside from the three tough points, negotiators on both sides have shown optimism.
article_snippet: On Saturday, Iranian Foreign Minister Javad Zarif showed some optimism about finding a path through the deadlock.
highlights_snippet: China's foreign minister says "marathon-like negotiations have reached their final stage"
  Secretary of State John Kerry: "We are working with a view to get something done"
  Potential snags to talks include how quickly sanctions on Iran would be lifted .