Beijing is positioning itself to lead the post-war reconstruction effort in Tehran - a move analysts suggest could secure China long-term access to critical Iranian oil reserves. The diplomatic groundwork was laid during a recent meeting in New Delhi between Chinese Foreign Minister Wang Yi and the deputy secretary of Iran's Supreme National Security Council, according to Nikkei Asia. The talks underscore China's broader strategy to expand its economic and diplomatic footprint in the Middle East amid the vacuum left in the wake of one failed US…