A once-feared Russian brigade has been wiped out in the war in Ukraine.

“In the Murmansk region we now have our borders bare,” the wounded soldier said.

Submarines armed with nuclear weapons patrol the icy waters along the Russian Kola Peninsula’s northern border, a region now home to a growing number of military installations. Missiles armed with warheads capable of destroying cities are stockpiled in bunkers buried in the hills.

An Arctic arsenal has been safeguarded by one of Russia’s most formidable combat units, the 200th Separate Motor Rifle Brigade, since the Cold War. This year, its finest fighters and weapons were sent to Ukraine, effectively destroying it.

On Feb. 24, the 200th Brigade was one of the first to enter Kharkiv as part of a ferocious counterattack. In May, the Brigade was retreating across the Russian border in desperate need of regrouping, according to brigade records obtained by The Washington Post and information supplied by Ukrainian and Western military and intelligence officials.

According to Western officials, the two battalion tactical groups of the Brigade remaining in late May had fewer than 900 soldiers, down from 1,400 in late May. Major wounds to the brigade commander were reported. Furthermore, some soldiers were listed as being hospitalized, missing, or “refuseniks” unwilling to fight, according to a cache of Russian military documents obtained by Ukraine’s security services and provided to The Post.

The 200th Brigade’s demise is a reflection of both the arduousness of its mission in the conflict and the valiant performance of Ukraine’s military. However, the same factors that derailed Vladimir Putin’s invasion plans—systemic corruption, strategic misjudgments, and a Kremlin misunderstanding of the true abilities of its own military and those of its adversary—also contributed to the Brigade’s demise.

Putin is attempting to salvage his grandiose objectives by mobilizing a badly depleted force, severely demoralized, and filled with inexperienced conscripts, after ceding territory and losing thousands of troops for months.