Tensions over Chinese-claimed Taiwan have risen as President Xi Jinping seeks to assert his country's sovereignty claims against the democratically ruled island. Taiwan's government says it wants peace, but will defend itself if needed.
Speaking virtually to a forum organised by Taiwanese think tank the Institute for National Policy Research, Abe noted the Senkaku islands - which China calls the Diaoyu Islands - Sakishima islands and Yonaguni island are a mere 100 km (62 miles) or so away from Taiwan.
An armed invasion of Taiwan would be a grave danger to Japan, he added.
"A Taiwan emergency is a Japanese emergency, and therefore an emergency for the Japan-U.S. alliance. People in Beijing, President Xi Jinping in particular, should never have a misunderstanding in recognising this," Abe said.
Japan is host to major U.S. military bases, including on the southern island of Okinawa, a short flight from Taiwan, which would be crucial for any U.S. support during a Chinese attack.
The United States is bound by law to provide Taiwan with the means to defend itself, though there is ambiguity about whether it would send forces to help Taiwan in a war with China.
The United States and its allies would take unspecified "action" https://www.reuters.com/article/us-usa-china-taiwan-idAFKBN2HV2PU if China were to use force to alter the status quo over Taiwan, U.S. Secretary of State Antony Blinken said last month.
Abe, who stepped down as prime minister last year, is head of the largest faction of the ruling Liberal Democratic Party and remains influential within the party.
On Sino-Japanese relations going forward, Abe said Japan should advance its ties with China while firmly saying to its giant neighbour what needs to be said, echoing incumbent Prime Minister Fumio Kishida.
"Japan, Taiwan and all the people who believe in democracy need to keep urging President Xi Jinping and other Chinese Communist Party leaders repeatedly not to step onto a wrong path," Abe said.
Japan and Taiwan must work together to protect freedom and democracy, added Abe, speaking to an audience that included Cheng Wen-tsan, mayor of the northern Taiwanese city of Taoyuan, tipped as a possible future presidential candidate.
"A stronger Taiwan, a thriving Taiwan, and a Taiwan that guarantees freedom and human rights are also in Japan's interests. Of course, this is also in the interests of the whole world," Abe said.
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