Outlining his priorities in a policy speech to parliament, Abe described North Korea's sixth nuclear test earlier this year and two missile launches that flew over Japan as a national crisis.
He promised concrete action to respond to what he called "escalating provocations" by North Korea.
"We will strengthen Japanese defense power, including missile defense capabilities, in order to protect the people's lives and peace," he said.
Abe called on the international community to put more pressure on North Korea to persuade it to change its policies. The 39-day special parliamentary session runs through December 9.
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Japan's defense spending has increased slowly but steadily since Abe took office in 2012. The government has said it plans to buy more American missile defense systems.
During his visit last week in Tokyo, President Donald Trump urged Abe to buy many more American weapons that allow Japan to shoot down North Korean missiles, raising questions if he was more interested in the business side of it.
US Ambassador to Japan William Hagerty stressed that Trump's primary focus is on security, not trade.
"Our overarching goal is to increase Japan's capability and interoperability. Our overarching goal is on security and defense," Hagerty said. "And (Japan's) goal is to make certain that more advanced technology is available to Japan."
He said there may be a positive impact on the trade deficit as well "but I assure you that's not the primary reason for this program.
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