US imperialism is a nasty and ugly thing. It’s paranoid, and it’s out to dominate the world. In contrast, Russia is not an imperialist power. Russia just wants friends and allies, not enemies. They are not out to dominate others; they want cooperation. There is still a lot of the spirit of the old USSR in Russia. Putin after all was a KGB man.
For instance, Russia is friends with many socialist states. They are very close to Venezuela, China, Vietnam and Cuba. They don’t care what kind of economic system you have in our country. Russia retained many of the more or less socialist allies of the old USSR in its sphere. It has not been pressuring them to get rid of socialism and adopt capitalism.
China is similar. Chinese investment in Africa does not care what kind of state or system the Africans have. They can be socialist, capitalist, or anything in between.
Russian and Chinese investment in the 3rd World is done more on a basis of mutual cooperation as opposed to imperialist exploitation which is typical of US imperialism.
When the US goes into a foreign country, they demand conditions favorable to US firms. This usually means favoring the wealthy elite of the country at the expense of the masses. The US tends to oppose any socialism in countries they invest in, and they often demand radical free market changes in the economy as a condition of investment. The US military is often as a threat used to force foreign countries to dismantle their socialism are put in radical neoliberal capitalism.
For example, the US opposes attempts to raise the minimum wage in 3rd World countries. Aristide in Haiti was overthrown by the US in part because he dared to raise the minimum wage. The US-backed coup in Honduras was sparked Zelaya’s raising of the minimum wage.
One reason is that Russia and China do not have many large non-state corporations yet. The Russian and Chinese firms that are involved in the 3rd World are often either state firms or quasi-state firms. Russia helps develop oil via their state oil corporation and makes money selling arms from state arms firms. So Russian and Chinese investment is done more on a win-win basis. Not quite solidarity, but at least not imperialist exploitation.