A recently released U.S. congressional report embraced President Barack Obama's recent visit to Hiroshima as a manifestation of a robust relationship between the United States and Japan.

The report, by the Congressional Research Service, Congress' nonpartisan research arm, also focused on the upcoming Upper House election in Japan, as well as possible detrimental impacts on the planned relocation of a key U.S. military base in Okinawa from a criminal incident involving a former U.S. Marine.

"The strength of the bilateral relationship was on display during President Obama's visit to Hiroshima in May 2016," it said, in reference to the May 27 pilgrimage to the world's first atom-bombed city in western Japan.