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The battle for Severodonetsk rages on. As the devastation and death toll mount, so does the confusion. [ABSTRACT FROM AUTHOR]

The Russian army in three months of fighting has lost as many soldiers killed in action as the Soviet army lost in nine years of warfare in Afghanistan starting in 1979, the U.K. Defense Ministry said Monday. [ABSTRACT FROM AUTHOR]

If every run to Snake Island risks one of the Black Sea Fleet's increasingly precious landing craft and its crew, the time soon could come when the island—for all its strategic value—just isn't worth it to Russia. [ABSTRACT FROM AUTHOR]

Ukrainian forces around Kharkiv, in northeastern Ukraine, apparently have pushed Russian troops east past Ternova, a settlement on the Russian border. If confirmed, it could mark an inflection point in the war. [ABSTRACT FROM AUTHOR]

The Ukrainian army reportedly has gone on the offensive in the country's war-torn east. For the faltering Russian war effort, this is very, very bad news. [ABSTRACT FROM AUTHOR]

The Ukrainian military can't easily retake Snake Island—at least not yet—but it already is on its way to rendering the island useless to the Russian fleet, if not transforming it from an asset into a liability for the occupiers. [ABSTRACT FROM AUTHOR]

It's a stalemate. [ABSTRACT FROM AUTHOR]

Russian forces apparently tried to create the impression they've shot down more of Ukraine's original three dozen or so TB-2s than they actually have done, all by staging old drone wreckage in a very sloppy mimicry of a recent crash. [ABSTRACT FROM AUTHOR]

In the two months since Russia widened its war on Ukraine, Kyiv's forces have located and destroyed no fewer than 31 Russian command and communications posts. [ABSTRACT FROM AUTHOR]

The Ukrainian army's 3rd Tank Brigade reportedly has reached the battlefield around Izium in eastern Ukraine. If this battle turns in Ukraine's favor, the government could owe the victory to a bunch of former taxi drivers and teachers riding in second-line tanks. [ABSTRACT FROM AUTHOR]

To knock out Russian vehicles, Ukrainian teams lie in wait along roads—sometimes for days—before firing their guided missiles and sprinting away to their own vehicles for a quick escape. [ABSTRACT FROM AUTHOR]

Today Ukraine's killer-drone fleet arguably is its most potent force. [ABSTRACT FROM AUTHOR]

The Russian army never had enough trucks to sustain a fast-moving invasion force in Ukraine. The problem has gotten a lot worse now that the Ukrainians have destroyed at least 485 of them — and Russia is going to the desperate length of pressing a motley array of civilian trucks into action. [ABSTRACT FROM AUTHOR]

As the war in Ukraine enters its third week, the Russian army might be able to restore some of the combat power it has lost to poor planning, poorer execution and heroic Ukrainian resistance. But Ukraine almost certainly can double its fighting strength, with strong foreign support. [ABSTRACT FROM AUTHOR]

The 55th Separate Artillery Brigade and the unidentified tank brigade hit the road in early February. [ABSTRACT FROM AUTHOR]

The Russian army's most obvious route across Ukraine is through the country's mostly flat, largely treeless east—good tank country. But western Ukraine is more rugged. And it's here that Kyiv stood up the 10th Mountain Brigade, which is lighter than most of the army's other combat brigades. [ABSTRACT FROM AUTHOR]

Ukraine aims to add 100,000 troops to the military's active ranks through 2025, potentially growing the armed forces by half. As a former Soviet republic, Ukraine has plenty of old heavy weapons in storage with which to equip new units. But money and equipment aren't the limiting factors. [ABSTRACT FROM AUTHOR]

The Ukrainian army now has many more and better helicopters and gunships than it did at the time of the 2014 Russian invasion, but they face even greater dangers along the front. [ABSTRACT FROM AUTHOR]

The fixed-wing type that has suffered the worst losses unsurprisingly is the type that must fly closest to the front. The Su-25 Frogfoot attack jet. [ABSTRACT FROM AUTHOR]

Kiev has 34 twin-engine Su-27s, which, despite their advanced age, still are some of the most powerful interceptors in the region. But that doesn't mean they'd last long against the Russians. And it's not clear Ukraine's leaders will risk losing them in a battle they may believe they can't win. [ABSTRACT FROM AUTHOR]

It's obvious where Russia's defense industry is most vulnerable to western economic sanctions—in the production of satellites and any other systems that require precision-made microchips. But it's also apparent that the Kremlin is prepared to adjust its defense planning to mitigate the impact. [ABSTRACT FROM AUTHOR]

In Russian doctrine, artillery—not tanks or infantry—is the decisive force. Russia's embedding of artillery with front-line units and its advances in drone surveillance allow it to target enemy units with impressive speed. [ABSTRACT FROM AUTHOR]

In Russian doctrine, artillery—not tanks or infantry—is the decisive force. Russia's embedding of artillery with front-line units and its advances in drone surveillance allow it to target enemy units with impressive speed. [ABSTRACT FROM AUTHOR]

Kiev again is counting on volunteers to bolster Ukraine's outgunned armed forces as Russia builds up a powerful invasion force—thousands of armored vehicles and equipment for up to 200,000 troops—along Ukraine's borders. [ABSTRACT FROM AUTHOR]

Ukraine, despite a strategic situation that's not unlike Taiwan's, let its undersea force rust away to nothing. [ABSTRACT FROM AUTHOR]

Under even the best of circumstances, a sea-to-land flanking operation—a so-called "counterlanding"—could be extremely risky for the outnumbered Ukrainian naval infantry. [ABSTRACT FROM AUTHOR]

Under even the best of circumstances, a sea-to-land flanking operation—a so-called "counterlanding"—could be extremely risky for the outnumbered Ukrainian naval infantry. [ABSTRACT FROM AUTHOR]

Russia needs trucks. But it's woefully short. [ABSTRACT FROM AUTHOR]

Seven years ago, the desperate Ukrainian army—relentlessly pummeled by Russian artillery along the front line in Ukraine's separatists-controlled Donbas region—opened up old warehouses and dragged out a handful of gigantic, ex-Soviet cannons. [ABSTRACT FROM AUTHOR]

The powerful Javelin anti-tank missiles Ukraine has received from the U.S. get a lot of attention. But the huge majority of Ukraine's anti-tank missile arsenal is the locally made Stugna-P, which is proving to be plenty dangerous — and cheaper. [ABSTRACT FROM AUTHOR]

The powerful Javelin anti-tank missiles Ukraine has received from the U.S. get a lot of attention. But the huge majority of Ukraine's anti-tank missile arsenal is the locally made Stugna-P, which is proving to be plenty dangerous — and cheaper. [ABSTRACT FROM AUTHOR]

Donbas is already a dangerous place for Ukrainian aircraft. It will get even more hazardous for anything that flies if Russia invades. [ABSTRACT FROM AUTHOR]

Russian forces must defeat Ukrainian counterattacks in order to keep the overall offensive moving west toward Kiev. Russian doctrine suggests they'll use decoys to funnel Ukrainian armor into kill zones. [ABSTRACT FROM AUTHOR]

Russian forces must defeat Ukrainian counterattacks in order to keep the overall offensive moving west toward Kiev. Russian doctrine suggests they'll use decoys to funnel Ukrainian armor into kill zones. [ABSTRACT FROM AUTHOR]

To clear mines, the Russian army deploys a rocket-propelled, rope-like explosive called a line charge. It can be used for a horrific secondary purpose—wantonly blowing up entire city streets. [ABSTRACT FROM AUTHOR]

It's the job of the Russian army's combat engineers, riding in BAT-2s and other vehicles, to clear paths for the assault troops. [ABSTRACT FROM AUTHOR]

If the Russians roll west, the TOS-1s could shoot first, targeting the Ukrainians' earthworks with their 220-millimeter thermobaric rockets. [ABSTRACT FROM AUTHOR]

A pair of the U.S. Air Force's best surveillance planes on Monday flew over eastern Ukraine fewer than 40 miles from territory controlled by Russian-backed separatists. [ABSTRACT FROM AUTHOR]

If the Russian forces currently massing along the border with Ukraine roll west, Russian ships and subs could strike at Ukraine's defenders, and leaders, with scores of Kalibrs. [ABSTRACT FROM AUTHOR]

The Ukrainian military is getting new killer drones. The Russian military, acutely aware of the threat, is preparing to hide its troops from the Ukrainian robots using a millennia-old countermeasure — smoke. [ABSTRACT FROM AUTHOR]

The U.S. Air Force has just 17 RC-135V/W Rivet Joints, its biggest and best intelligence aircraft. Nearly half of them were in the air at roughly the same time Monday night through Tuesday afternoon, many of them near Russia. [ABSTRACT FROM AUTHOR]

Ukraine possesses some of the same tank models that Russia does, but Kiev's best tank—an updated T-64—is uniquely Ukrainian. [ABSTRACT FROM AUTHOR]

Tanks destroying other tanks makes for exciting cinema, but in actual warfare opposing armor seldom clashes. Here's how Russia and Ukraine would use their tanks if war breaks out. [ABSTRACT FROM AUTHOR]

Russia apparently tried—and mostly failed—to stage a crisis in the Sea of Azov on Thursday and Friday. [ABSTRACT FROM AUTHOR]

The United States and France are surging some of their best surveillance aircraft into the Black Sea region as Russia masses forces for a possible invasion of Ukraine in coming weeks or months. [ABSTRACT FROM AUTHOR]

Kiev's fleet operates exactly one major surface combatant. And "major" is a relative term, in this case. [ABSTRACT FROM AUTHOR]

Two air-defense campaigns—in Georgia in 2008 and Ukraine's Donbas region in 2014 and 2015—surely loom large in the minds of air-defense officers on both sides as Russia masses forces for a possible overt attack on Ukraine. [ABSTRACT FROM AUTHOR]

Considering what the Russians must do to win a full-scale war in Ukraine—and what the Ukrainians must do to prevent the Russians from winning—it's not at all clear that 1,200 deployed tanks is enough for the Russians, and that 900 active tanks is inadequate for the Ukrainians. [ABSTRACT FROM AUTHOR]

If Russia openly invades Ukraine in coming weeks or months—as many observers fear is increasingly likely—Russian troops rolling into eastern Ukraine would collide with fortifications that Ukrainian troops have spent years constructing. [ABSTRACT FROM AUTHOR]

The war in Ukraine is, more than anything, an artillery war. [ABSTRACT FROM AUTHOR]