Japan and the United States will expand cooperation in the U.S.-led campaign against terrorism to include closer aid-policy coordination for Afghanistan and other strategically important countries, government sources said Thursday.

Top-level aid officials from the two countries — by far the world's largest aid donors — will hold talks in Tokyo in the middle of June to kick off full-scale policy coordination efforts, the sources said.

The U.S. participants in the meeting will be officials of USAID, an arm of the State Department, while Japanese representatives will include high-level Foreign Ministry officials, the sources said.