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π§΅1st, 2nd, 3rd defensive lines explainer. Russian/Ukrainian military doctrine. 
Defensive lines can be categorized in several ways:
- 1st, 2nd, 3rd - just as you see them in front of you
- security zone, main defensive line, interim defensive line, rear defensive line - according to their designation
- front, army, corps defensive lines
- 1st, 2nd, 3rd - just as you see them in front of you
- security zone, main defensive line, interim defensive line, rear defensive line - according to their designation
- front, army, corps defensive lines
1. The security zone (cover zone, ΠΏΠΎΠ»ΠΎΡΠ° ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΡ, Π·ΠΎΠ½Π° ΠΏΡΠΈΠΊΡΡΡΠΈΡ).
The main purpose of the security zone is to slow down the advance of the advancing enemy troops, to exhaust them with battles even before meeting with the main forces.
The main purpose of the security zone is to slow down the advance of the advancing enemy troops, to exhaust them with battles even before meeting with the main forces.
In the security zone, natural obstacles are strengthened and artificial obstacles are created (wires, ditches, scarps & counterscarps, anti-tank barriers and dragon's teeth), traps are created, positions are equipped for troops providing cover, and mining is carried out.
The security zone neutralizes the effect of a surprise of attack, giving the defender the opportunity to concentrate the main forces, provide a stable defense and go on the counteroffensive.
2. Main defensive line designed to prevent the further advance of enemy troops that have broken through the security zone, and to ensure the deployment of troops inflicting a counterattack.
It usually consists of 2-3 lines to a depth of 15-20 km in which both army reserves and part of the front reserves (second echelons of the front), as well as withdrawing formations are deployed.
3. Interim defensive line is designed to limit access to the depth of the defense of enemy mobile formations that have broken through, stop (rout) them and serve as an advantageous starting line for delivering decisive counterattacks from the depth of defense.
Interim defensive lines are build between defensive lines of other types: between 1st and 2nd line of defense, between 2nd line of defense and an army line of defense etc.
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