Visiting U.S. Deputy Secretary of State James Steinberg said in Tokyo Friday that he and Foreign Minister Katsuya Okada are discussing how to coordinate more closely on the nuclear challenges of Iran.

But on the hot-button issue of moving U.S. Marine Corps Air Station Futenma, Steinberg only said the two countries were working hard to resolve it.

"We talked about the full range of our bilateral issues and it's something that both sides are working on very productively," Steinberg told reporters, referring to Futenma. "I am grateful for the continued support and engagement of the foreign minister and all of the Japanese government on this issue."