Japanese prosecutors in Europe have repeatedly quizzed former elite diplomat Kazuhiko Togo over a breach of trust case involving two Foreign Ministry officials now under arrest and a government-funded committee on aid to Russia, investigative sources said Tuesday.

Masaru Sato, 42, a veteran Russian affairs expert at the Foreign Ministry, and Akira Maejima, 37, assistant director of the ministry's Oceanian Division, were arrested May 14 and later charged with illegally procuring 30 million yen in travel expenses from the Cooperation Committee.

The money went to Japanese participants in an international conference in Israel in 2000