Chief Cabinet Secretary Yoshihide Suga says Chinese President Xi Jinping's state visit to Japan is expected to take place in April as planned.
Suga told reporters on Tuesday that Japan is closely watching developments concerning China's National People's Congress.
Britain has urged Japan to raise its reduction target for greenhouse gas emissions ahead of a UN climate change conference later this year.
All members of the Paris Agreement are required to submit their new reduction targets to the United Nations by the end of this month.
Japan is expected to become capable of testing up to about 3,800 people a day for the coronavirus on Tuesday, as it is working to boost its testing capabilities.
The health ministry told municipalities across Japan to expand the scope of their screenings to include people with suspected infections who have had no travel history to the Chinese provinces of Hubei or Zhejiang.
The World Health Organization says it is working closely with Japanese authorities and medical officers of the Diamond Princess to respond to coronavirus infections.
More than 450 people on board the cruise ship docked at Yokohama Port have been confirmed to have the virus.
Weather officials are forecasting heavy snow in western Japan, and warn that traffic may be disrupted.
Japan has been having a mild winter, but a cold air mass is bringing snow to some areas of western Japan.
Two chartered aircraft sent by the US government to evacuate American citizens from a quarantined cruise ship have arrived in Japan.
The planes touched down at Tokyo's Haneda airport at around 10:30 p.m. on Sunday. Workers in protective clothing were seen loading luggage onto the aircraft.
New cases of the coronavirus in Japan have been confirmed, bringing the total to over 330, including 285 on a cruise ship offshore.
Health authorities are working quickly to come up with effective measures to contain the spread after they found it hard to track down the infection routes of some cases.
Health experts confirmed new cases of the coronavirus across Japan on Saturday. The total number of infections is now over 330, including 285 on a quarantined cruise ship.
Tokyo Metropolitan Government officials said on Saturday that eight more people had been confirmed to be infected with the virus there.
A group of Japanese people who evacuated the virus-stricken Chinese city of Wuhan on the third government-chartered flight, except for one, have gone home after a quarantine period.
Japan's health ministry says when they returned to Japan on January 31st, all 145 people tested negative for the new coronavirus and exhibited no symptoms, such as fever,.
Japan's health ministry has decided to begin clinical trials on patients infected by the new coronavirus with a drug used to treat HIV.
Thailand and other countries have reported that the symptoms of coronavirus patients improved after they were administered antiviral drugs that are used to prevent the onset of AIDS.
Health experts are studying new cases of the coronavirus across Japan. They say the total number of infections in the country has climbed to 262.
Authorities said on Saturday a second doctor, his wife and an inpatient at a hospital in Wakayama Prefecture in western Japan all tested positive.
Several cases of the new coronavirus infections were reported in Japan on Friday. The total number in the country stands at 259, including 218 from a cruise ship quarantined in Yokohama south of the capital.
Among the new cases, two people live in Tokyo.
Organizers of an event to showcase Japanese culture in line with this summer's Tokyo Olympic and Paralympic Games unveiled on Friday the details of the opening ceremony.
The ceremony for the Japan Cultural Expo will be held on March 14 in two parts at the Tokyo National Museum.
Japan saw several new cases of coronavirus infection reported on Friday, leading health officials to try and establish just how they contracted the virus. The latest cases bring the number of infected people in Japan to 259, including 218 from a cruise ship.
Two people are residents of Tokyo.