An invasion.
The country can defend itself should another country attack it.
Invasions involve the aggressive entry of armed forces into a country or territory which is not their own with the intent to conquer or establish control over its inhabitants. Invasions can lead to war or indicate the end of a war.
Yes, America's armed forces belong only to America. We do not share it with another country.
An invasion is when one country sends its armed forces into another without agreement, and with hostile intentions towards that country.
I am not sure
I am not sure
One would conquer the world, meaning to take control of it by armed force.
Invaded means going with armed forces into another country. An invasion may be done against an enemy country, or to liberate a friendly country from an enemy, or for other strategic reasons.
Costa Rica, in Central America, is a little country that has not a permanent armed force.
An invasion is when one country sends its armed forces into another without agreement, and with hostile intentions towards that country.
Egypt has the strongest armed forces
Any country whose borders are under attack would, initially, put their armed forces on alert, and on a war footing. Then, possibly, conscription of able bodied males would be enforced.