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I answered your question, you silly person.
Why would any other country rely on us for military equipment instead of working on their own?
It's not just about cost but industrial infrastructure and engineering expertise. There are rich and stable countries, that are unable to make their own advanced arms because their society and culture doesn't value scientific study, education, and manual labor highly.
Saudi Arabia has a limited ability to make arms (assault rifles, armored trucks) while swimming in money. North Korea is dirt poor, but has the culture and determination to build tanks, artillery, ships, submarines, guided missiles, even ICBMs and nuclear bombs.
Which brings me to a point I didn't mention earlier. Buying arms from abroad also buys good will and diplomatic relations. That's a major reason why the Saudis buy mostly American and European arms.
Otherwise, I haven't even used the word colonialism, but imperialism. China was called Chinese Empire until 1912. They were weak at the time because of technological, societal, administrative and scientific deficiencies. The Republic of China and the People's Republic of China laid claim to the same imperial possessions. It's a continuation of the same imperial civilization under a different name.
I mentioned specific things, not everything.
It's a tank. It's not a main battle tank.