It has been three years since North Korea last tested submarine-delivered missiles, which pose a particularly serious challenge because they are harder to detect and extend the range of the North’s arsenal.
U.S. President Donald Trump said on Monday a deal with Iran on its nuclear programme was possible, crediting economic sanctions for curbing activities Washington has said are behind a spate of attacks in the Middle East.
The defeats in the Sunday polls come after Japan's Olympics minister, Yoshitaka Sakurada, resigned a year before the Tokyo Games for remarks that offended people affected by the massive earthquake and tsunami.
Abe visited Okuma, one of two towns that house the plant, where an evacuation order was partially lifted earlier this month. The government has been carrying out decontamination efforts to lower radiation levels in the region.
Trump has made clear he prefers a bilateral deal to cut a U.S. trade deficit with Japan that hit $5.64 billion last month. However, Abe's administration insists multilateral pacts are still the best bet.
Prime Minister Narendra Modi on Monday held a series of meetings with top Japanese leaders, including Foreign Minister Taro Kono and held productive, focused discussions on bilateral, regional and global issues