As part of Prime Minister Shinzo Abe's push to get Japan a greater security role overseas, the government is planning to present 15 military contingency scenarios at the ruling coalition's ongoing talks this week, a source said.

The scenarios include one in which the Self-Defense Forces protect U.S. vessels in a military emergency when a neighboring country is preparing to launch a ballistic missile, the government source said Saturday.

Another involves the SDF protecting U.S. vessels carrying Japanese on the high seas, the source said.