Congratulatory messages are pouring in for Iranian President Hassan Rouhani following his re-election. 

Chinese President Xi Jinping in a message said Iran has gained new socio-economic achievements over the past four years under Rouhani's leadership, and that ties between the two nations have maintained sound momentum of development. 

In a telegram to Rouhani, Russian President Vladimir Putin said Russia is ready to further develop cooperation with Iran. Putin also expressed confidence Moscow and Tehran will continue to work towards maintaining regional stability in the Middle East and the world.

EU foreign affairs chief Federica Mogherini said the bloc would sustain efforts to comply with the 2015 nuclear deal.