"It's paramount to calm the situation down soon," Ishiba told reporters at the prime minister's office in Tokyo.
"Iran's nuclear development must be blocked," he added.
When asked whether Japan supports the US attacks, Ishiba said only that his government will fully discuss it.
The prime minister also said he has instructed relevant government bodies to take every measure to ensure the safety of Japanese citizens in the Middle East.
[Copyright The Jiji Press, Ltd.]
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