The term for an array of nonaligned or friendly states that serve as a buffer or protective zone for a larger country is "buffer states." These states can mitigate the risk of invasion and provide strategic depth, as seen historically with the Soviet Union and its eastern neighbors during the Cold War. Buffer states often maintain a degree of independence while being influenced by the larger power they neighbor.
He wanted to prevent an invasion.
The Bay of Pigs Invasion happened in 1961.
Invasion of Île Bonaparte happened on 1810-07-09.
Cao Cao's invasion of Xu Province happened in 193.
He wanted to prevent an invasion.
Be more specific. The German invasion of their neighbors or the Allies invasion of Germany.
The D-Day invasion beaches and defences were bombed beforehand. The invasion happened after.
Invasion of Nejd happened in 625.
Invasion of Badr happened in 626.
Ōei Invasion happened in 1419.
Prey Invasion happened in 2009.
Invasion of Waikato happened in 1864.
Hidden Invasion happened in 2001.
Toi invasion happened in 1019.
Invasion of Buwat happened in 623.
Invasion Orion happened in 1979.
Laser Invasion happened in 1991.