Iranian President Hassan Rouhani says he remains optimistic about the prospect of reaching a deal with world powers over his country's nuclear programme.
Rouhani has made the comments while attending an inauguration ceremony for a new gas field in Iran.
"We are steadfastly standing before the world's powerful countries, the P5+1, resorting to logic and with God's assistance and grace, sooner or later we will reach a conclusion in the path of talks."
The comments from Rouhani come as US and Iranian diplomats continue talks in Lausanne, Switzerland.
The US side says despite the progress that's been made, the prospect of reaching a nuclear deal before the end of March
