The U.S. is sending 14 F-22 stealth fighter jets to an air base in Japan for a month, the Sankei Shimbun reported on Thursday.

The aim seems to be to build up military pressure on North Korea in case that ongoing negotiations with North Korean officials fail.

The daily said 10 F-22s arrived at Kadena Air Base in Okinawa on Wednesday and the rest are also expected to follow soon.

The U.S.' most advanced fighter jets are deployed in Japan for the first time in four years.

They will stay in Japan for a period required for regional security, a spokesman for the U.S. Forces Japan said. Another U.S. military officer said that their deployment comes in readiness for the U.S.-North Korea summit slated for June 12, according to NHK.