[smm2000]

Find country that need (but does not have yet) ICBM capabilities and pitch them that you can build rocket for them. They will provide all funding you will ever need.

[chasd00]

that's a great way to end up dead by the countries who do not wish said country to have an ICBM.

[jonas21]

or, more likely, to end up dead by said country once they realize you have no idea what you're doing