Amid rising tensions over Iran's nuclear program, the United States has reached out to a number of "like-minded countries," including Japan, regarding options to ensure freedom of navigation in the Persian Gulf, the visiting Saudi Arabian state minister for foreign affairs said Tuesday in Tokyo.

Adel al-Jubeir, who came to Japan for the Group of 20 Osaka summit, declined to comment on which specific options are now being discussed between the countries, which he also declined to name.

But he said the options now being studied included both military and economic measures as well.