US national security adviser Jake Sullivan says the United States will never recognise Russian-controlled areas of Ukraine as "anything other than parts of Ukraine", after signs that Russia could soon push for what the US calls "sham referenda" for local populations.

US national security adviser Jake Sullivan says the United States will never recognise Russian-controlled areas of Ukraine as "anything other than parts of Ukraine", after signs that Russia could soon push for what the US calls "sham referenda" for local populations.