U.S. President Donald Trump is set to conclude his four-day trip to Japan on Tuesday amid high levels of security, with 25,000 police reportedly deployed for his visit.

But with Trump scheduled to be back in Osaka in exactly one month for the Group of Twenty (G20) leaders' summit, officials and residents are becoming increasingly concerned about how security preparations not only for Trump but also other world leaders, from Chinese President Xi Jinping to Russian President Vladimir Putin, will impact Osaka and the surrounding region before and during June 28-29 summit.

The venue for the conference is Intex Osaka on the city's waterfront area. But world leaders will be staying at hotels located elsewhere, particularly in the northern Umeda area. Bilateral meetings between Abe and other leaders, including Trump, may take place at the Osaka state guest house in Osaka Castle Park, which offers more photogenic scenery than Intex Osaka and is closer to the hotels in the Umeda district.