Mugabe was speaking at the burial of Mrs Sunny Ntombiyelanga Takawira, the late wife of the late veteran nationalist Leopold Takawira at the national heroes acre in the capital Harare.
Mugabe is know for making most of the crucial policy aggression over a dead body.
"We need (outsiders) but only to the extent that they are partners who would partner us to exploit the country’s resources for the development of the country," Mugabe told mourners at the national shrine.
"As is the case with every nation in the world the interests of the nation comes first and Zimbabweans must be prepared to defend those interests.The country’s sovereignty is not negotiable, its non negotiable."
Mugabe also appealed for Zimbabweans to unite for the country’s development adding that the country needs peace to develop.
"The unity of our people remain important.It is indeed paramount in all our endeavours. Equally peace, the peace of our country must continue to prevail in-order to ensure that development will occur uninterrupted," Mugabe said."
Let us honour our heroes by ensuring that each one of us wherever we are promote unity, harmony and peace in our country as indeed also promote the ideal of the sovereignty of our nation."