UN secretary-general Antonio Guterres called Russian President Vladimir Putin's talk of using nuclear weapons 'totally unacceptable' and referred to the idea of holding referendums in occupied parts of Ukraine as a 'violation of international law'.

UN secretary-general Antonio Guterres called Russian President Vladimir Putin's talk of using nuclear weapons 'totally unacceptable' and referred to the idea of holding referendums in occupied parts of Ukraine as a 'violation of international law'.