The two leaders met in Tokyo on Wednesday and announced the signing of a comprehensive strategic partnership, upgrading bilateral ties to a higher level.
They also signed a bilateral social security agreement aimed at helping citizens of both countries gain access to benefits, including pensions, when working abroad, Polish state news agency PAP reported.
Tusk said relations with "stable, responsible and predictable partners" were invaluable and argued that Poland and Japan "can and should play a stabilising role in their regions and in the world."
He said his talks with Takaichi, as well as with Japanese business leaders, covered a wide range of topics, including space cooperation, nuclear energy, high-speed rail, cybersecurity, artificial intelligence and agriculture.
Both leaders pledged to support businesses and investors from their countries in expanding operations in each other’s markets.
Takaichi said the two nations would strengthen cooperation in security, including the defence industry, and expand economic ties, the PAP news agency reported.
She added that Poland and Japan signed a memorandum of understanding on agricultural cooperation and agreed to closer collaboration between their space agencies.
She said the upgraded partnership would also cover infrastructure and advanced technologies, including artificial intelligence.
Polish government spokesman Adam Szłapka said the move to a "comprehensive strategic partnership" would further boost two-way business and investment.
He added that Japanese companies already play a significant role in Poland’s economy, creating jobs and contributing to growth.
Szłapka also said that closer ties between Poland and Japan were "crucial for maintaining stability in the current geopolitical environment."
The meeting with Takaichi was the final stop of Tusk's visit to Tokyo.
Earlier, he travelled to South Korea, where he discussed expanding trade, removing barriers to Polish agricultural exports, including beef, and strengthening cooperation in the defence sector.
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Source: IAR, PAP