structural:expansion, linguistic:paraphrasing
Security and defense issues

In his April speech to the US Congress, Abe announced that his government would "enact all necessary bills by this coming summer" to expand the Self-Defense Forces' capacity for operations and to give effect to the cabinet's July 2014 decision to re-interpret the constitution in favor of collective self-defense. The Abe cabinet then introduced 11 bills making up the "Peace and Security Preservation Legislation" into the Diet in May 2015, which pushed for a limited expansion of military powers to fight in a foreign conflict. The principal aims of the bills were to allow Japan's Self-Defense Forces to come to the aid of allied nations under attack (even if Japan itself was not), to expand their scope to support international peacekeeping operations, and to allow for Japan to take on a greater share of security responsibilities as part of the US-Japan Alliance.

To allow for enough time to pass the bills in the face of lengthy opposition scrutiny, the Abe cabinet extended the Diet session by 95 days from June into September, making it the longest in the post-war era. The bills passed the House of Representatives on 16 July with the support of the majority LDP-Komeito coalition. Diet members from the opposition Democratic, Innovation, Communist, and Social Democratic parties walked out of the vote in protest at what they said was the government's move to force the bills through without sufficient debate and ignore "responsible opposition parties". Abe countered by arguing that the bills had been debated for "as many as 113 hours" before the vote. While common practice in many other parliamentary democracies, a government using its majority to "railroad" controversial bills through the Diet in the face of political and public opposition is a subject of criticism in Japan.

As a result of these moves, Abe faced a public backlash, and opinion polls showed that his approval ratings fell into negative figures for the first time since he returned to power in 2012, with 50 percent disapproving and 38 percent approving of the cabinet according to one Nikkei survey taken at the beginning of August. Many protested outside the Diet buildings, denouncing what was referred to as "war bills" by opponents. Organizers of the protests estimated that up to 100,000 protesters marched against the bills' passage of the lower house in July. During Diet committee hearings on the bills, constitutional scholars (some of whom had been invited by the ruling parties) and a former Supreme Court justice argued that the legislation was unconstitutional. Abe was publicly criticized by atomic bomb survivor Sumiteru Taniguchi in his speech at the Nagasaki memorial ceremony on 9 August, when he stated that the defense reforms would take Japan "back to the wartime period". Members of the Abe cabinet said that they would make a greater effort to explain the contents of and the reasons for the security legislation to the public, with the LDP releasing an animated cartoon commercial, and Abe appearing live on television and internet chat streams to make the case for the legislation and take questions from members of the public.

The security bills were finally approved by the House of Councillors, 148 votes to 90, and became law on 19 September. This followed opposition attempts using delaying tactics as well as physical altercations, in which some Diet members attempted to stop the relevant chairman from calling the vote to move the bill out of committee and to a general vote. After the vote, Abe issued a statement saying that the new laws "will fortify our pledge to never again wage war", and that the legislation, rather than being "war bills", was instead "aimed at deterring war and contributing to peace and security". He also pledged to continue to explain the legislation to try to gain "greater understanding" from the public on the issue. Following the bills' passage, Abe was expected to once again return his focus to economic issues.

On 18 October 2015 Abe presided over the triennial fleet review of the Japan Maritime Self-Defense Force (JMSDF) in his role as Commander-in-Chief of the Self-Defense Forces. In his speech to personnel on board the destroyer Kurama, he announced that "by highly hoisting the flag of 'proactive pacifism,' I'm determined to contribute more than ever to world peace and prosperity". Later that day he went aboard the USS Ronald Reagan, becoming the first Japanese prime minister to set foot on an American warship.

In December 2015, the Abe government announced the creation of a new intelligence unit, the International Counterterrorism Intelligence Collection Unit, to aid counter-terrorism operations, to be based in the Foreign Ministry but led by the Prime Minister's Office. This was reported as being part of efforts to step up security measures in preparation for the 2016 G7 Summit in Shima, Mie, and 2020 Olympics in Tokyo. In the same month the cabinet approved Japan's largest-ever defense budget, at 5.1 trillion yen (US$45 billion), for the fiscal year beginning in April 2016. The package included funding intended for the purchase of three "Global Hawk" drones, six F-35 fighter jets, and a Boeing KC-46A midair refueling aircraft.