blockade, encirclement -- (a war measure that isolates some area of importance to the enemy)
blockade -- (prevents access or progress)
Overview of verb blockade
The verb blockade has 4 senses
obstruct, blockade, block, hinder, stymie, stymy, embarrass -- (hinder or prevent the progress or accomplishment of; "His brother blocked him at every turn")
barricade, block, blockade, stop, block off, block up, bar -- (render unsuitable for passage; "block the way"; "barricade the streets"; "stop the busy road")