Russia has joined the growing list of countries to impose a ban on Japanese food imports, as the country continues to struggle to cope with both a humanitarian crisis and the threat of a nuclear disaster.

On Thursday, two workers at the Fukushima Daiichi nuclear power complex were taken to hospital after being exposed to radiation. A third worker who was exposed did not require hospitalisation.

White smoke has been seen coming from four of the plant's six reactors, with national broadcaster NHK reporting that this is the first time reactor number one has emitted such smoke.

Al Jazeera's Azhar Sukri reports.