The European Union's foreign policy chief said an Iran nuclear deal was "at hand" and urged different sides to show political will ahead of a new round of talks.
Russia voiced confidence that world powers and Iran would be able to reach a comprehensive accord over Tehran's disputed nuclear programme by a June 30 final deadline.
Israeli Prime Minister admitted he has a "profound disagreement" with President Barack Obama over efforts by the US and world powers to resolve the Iranian nuclear issue.
Secretary of State John Kerry stressed to his Iranian counterpart that the US aimed to meet a late March deadline for a deal reining in Iran's nuclear programme.
January 23 Tengrinews.kz reported that Kazakhstan had started talks with Toshiba, owner of Westinghouse, to construct its first nuclear power plant. As early as in March the sides might sign an agreement on supplying a $3.7 billion reactor capable of 1 gigawatt.
Iran and the US held more than six hours of talks seeking to nail down a complex nuclear deal, but negotiators remained tight-lipped on what progress had been made.
Brazilian President inaugurated a naval shipyard that will oversee construction of a nuclear-powered submarine and four others to patrol Brazil's long coastline and oil reserves.
British Foreign Secretary Philip Hammond expressed doubt that a landmark nuclear deal between Iran and six world powers would be reached by the deadline.