Japan needs to deal with the issue of Japanese spouses taking their children from their divorced international partners or it could affect bilateral ties with the United States, Kurt Campbell, assistant secretary of state, said Tuesday.

Campbell, in Tokyo for meetings on strengthening the Japan-U.S. alliance, held a special news conference at the U.S. Embassy on parental child abductions to urge Japan to take action in cases where American parents have little or no access to their children.

"Many of their situations are tragic and the situation has to be resolved in order to ensure that U.S.-Japan relations continue on such a positive course," Campbell said. "This issue left unresolved has the potential to raise very real concerns — something that all of us seek to avoid."