Either we allow the Russians and Chinese into our hemisphere or we don’t. But the second part of the Monroe Doctrine was that we would stay our of Europe and their business.
Seems like we reap what we sow.
And if our issue is with the Russians and Chinese, we can take that up with them directly.
No reason to start what would be an oil and endless-war war on the ground in a country that would be more physically challenging than Afghanistan or Vietnam.
More like the Europeans would stick to their own business and we would leave existing colonies alone but they better not start trying to “accumulate” new colonies...and if they did crap that messed with us they could expect some “resistance”.