Japan's government will temporarily ban entry of all non-resident foreign nationals as a precaution against a new and potentially more contagious corona virus variant that has spread across Britain. The entry ban will start on Monday and last through January 31 for the time being, the Foreign Ministry said in a statement late Saturday. Japan banned entry of non-resident foreigners from Britain and South Africa last week, but is further stepping up border control after confirming the new variant in seven people over the last two days - five returnees from Britain who tested at airports and two other in Tokyo. Japan is also suspending exemptions of a 14-day quarantine for Japanese nationals and resident foreigners on a short-track programme that began in November. The entrants now must carry proof of a negative test 72 hours prior to departure for Japan and self-isolate for two week after arrival.