China won’t bow to foreign pressure to reform its yuan exchange-rate policy, a senior Chinese official said Tuesday.

Calling the reform “an internal affair,” Cui Tiankai, vice minister of foreign affairs, said at a news briefing after a two-day global nuclear-security summit that Chinese policymakers are committed to the goal of reform because it meets the nation’s own need for economic and social developments.

“It is not justified for outsiders to exert pressure on China and we will not take actions by bowing to this pressure,” said Cui.