Russia’s Military, Once Creaky, Is Modern and Lethal

In the early years of Vladimir V. Putin’s tenure as Russia’s leader, the country’s military was a hollowed-out but nuclear-armed shell.

It struggled to keep submarines afloat in the Arctic and an outgunned insurgency at bay in Chechnya. Senior officers sometimes lived in moldy, rat-infested tenements. And instead of socks, poorly trained soldiers often wrapped their feet in swaths of cloth, the way their Soviet and Tsarist predecessors had.

Two decades later, it is a far different fighting force that has massed near the border with Ukraine. Under Mr. Putin’s leadership, it has been overhauled into a modern sophisticated army, able to deploy quickly and with lethal effect in conventional conflicts, military analysts said. It features precision-guided weaponry, a newly streamlined command structure and well-fed and professional soldiers. And they still have the nuclear weapons.

The modernized military has emerged as a key tool of Mr. Putin’s foreign policy: capturing Crimea, intervening in Syria, keeping the peace between Armenia and Azerbaijan and, just this month, propping up a Russia-friendly leader in Kazakhstan. Now it is in the middle of its most ambitious — and most ominous — operation yet: using threats and potentially, many fear, force, to bring Ukraine back into Moscow’s sphere of influence.