WASHINGTON (Reuters) -A plan by the top U.S. banking cop to make the sector more resilient may have gotten a boost from the recent banking crisis, but still faces numerous challenges. Fed Vice Chair for Supervision Michael Barr has laid out a plan to increase capital requirements for the nation's largest banks in the wake of recent bank failures and is expected to unveil the broad proposal to implement new risk-based capital requirements on July 27, according to three industry officials. The proposal, which will kick off an ambitious agenda for Barr, plans to fully implement the globally agreed Basel bank capital agreement.