KYIV, Ukraine—A planned missile test over the Black Sea spurs a Kremlin threat to shoot down the missiles and possibly target the launch sites.

An eleventh-hour compromise is reached, defusing an act of brinkmanship, which could have sparked an all-out war.

An episode between NATO and Moscow during the Cold War? Or, perhaps, the latest chapter in the contemporary conflict between NATO and Russia, which some have dubbed a “new” Cold War?

Rather, the aforementioned sequence of events was the most recent episode in a nearly 3-year-old conflict, in which Russia and Ukraine—the two countries with the largest land armies in Europe—have repeatedly tiptoed to the edge of all-out war.

“Ukraine does not want to be someone’s post-Soviet reintegration project,” Serhii Plokhy, a Ukrainian history professor at Harvard University, told New Eastern Europe, a news magazine.

On Dec. 1, Ukraine announced it had successfully tested 16 medium range surface-to-air missiles within a designated airspace over the Black Sea.

Ukraine’s missile test met the airspace requirements mandated under international law, providing a buffer of at least 19 miles from Russian airspace extending from the Crimean Peninsula, a territory Russia illegally annexed from Ukraine in 2014.

But as tensions with Russia neared a boiling point, Ukrainian officials shifted the airspace further away from Crimea.

The test ultimately went off without starting a war (or, more correctly, without escalating the one that’s already ongoing in eastern Ukraine), and both Ukraine and Russia sheathed their well-rattled sabers.

Just three months prior, in early August, Ukraine and Russia had gone to the brink of war after several sabotage attacks and skirmishes in Crimea, which Russia said were organized by Ukraine’s armed forces.

Russian President Vladimir Putin accused Ukraine of provoking a conflict and pursuing a “policy of terror.”

Ukrainian President Petro Poroshenko denied the allegations, calling them “insane.”

In Crimea, some of the 45,000 Russian troops stationed there began to concentrate in the north near the Ukrainian border.

Ukrainian military units went on the “highest level of alert,” and Poroshenko ordered the deployment of heavy weaponry near the Crimean border, according to Ukrainian government statements at the time.

And on Aug. 12, Russia deployed S-400 Triumph surface-to-air missiles to Crimea. The missiles’ range covers about 60 percent of Ukraine’s territory, according to an analysis by IHS Markit.

“These fantasies pursue only one goal,” Poroshenko said in a statement emailed to journalists in August. “A pretext for more military threats against Ukraine.”

Eastern Europe is no longer a geopolitical no man’s land over which NATO and Moscow jockey for control.

The region is a multipolar powder keg perpetually ebbing and flowing to the brink of regional war as Russia harasses post-Soviet states from the Black Sea to the Baltics in a gambit to reassert influence over what the Kremlin considers its “near abroad.”

A War by Any Other Name:

More than 10,000 soldiers and civilians have already died in the ongoing war in eastern Ukraine, where Ukrainian troops are squared off in static, trench warfare against a combined force of pro-Russian separatists and Russian regulars.

It is Europe’s only ongoing land war, comprising the two largest standing armies on the Continent. It is also a war in which one of the players, Russia, wields the world’s largest nuclear weapons arsenal.

The two sides continue to trade artillery and mortar shots and engage in small arms gunfights every day across hundreds of miles of front lines in the Donbas, Ukraine’s embattled southeastern region on the border with Russia.

The U.S. role in the conflict is limited to a training mission for the Ukrainian military in the western part of the country about 800 miles from the front lines, as well as various advisory missions.

The U.S. has provided Ukraine with nonlethal military hardware and supplies, including Humvees, Raven drones, counter battery radar systems, and meals ready to eat (MREs).

Lethal military aid for Ukraine is an ongoing topic of debate in Washington.

When U.S. lawmakers debate whether to arm Ukraine, they typically focus on how an influx of U.S. weapons will affect the current conflict in the Donbas. There are concerns that U.S. weapons could worsen the conflict, or spur the Kremlin to supply more arms to the separatist side.

But Ukraine isn’t asking for U.S. military assistance to fight trench skirmishes in the Donbas—it wants anti-aircraft missiles and anti-tank weapons to stop a Russian invasion.

“Our enemy is the country, the territory of which is equal to one-ninth of the land area on the Earth, and a military budget a dozen times higher than ours,” Poroshenko said during a speech at Ukraine’s Independence Day parade in Kyiv in August.

Fight or Flight

Ukraine now has the second-largest standing army in Europe; Russia has the largest.

After a two-year crash course to rebuild its military, Ukraine has increased its active-duty ranks from 150,000 to 250,000 troops.

(France has about 209,000 active troops, Germany has about 176,750 active troops, Spain has about 133,000, Poland has about 101,500, and the U.K. has about 153,600.)

Ukraine rebuilt its army “almost from scratch within two years,” Poroshenko said in the Independence Day speech.

Today, “Ukraine is capable of defending itself, but requires further support,” Poroshenko said.

Ukraine has also increased its defense budget to about $6 billion, representing roughly 5 percent of the country’s gross domestic product. Military spending is set to increase by about 10 percent annually.

Russia, which has three times the population of Ukraine and 10 times the GDP, has an active-duty force of about 800,000 with a reserve force of 2 million. Russia’s 2015 defense budget was about $65 billion—roughly 10 times that of Ukraine and on par with the United Kingdom.

Ukraine’s annual defense budget is still a fraction of Western military powers, such as France (about $36 billion), Germany (about $37 billion), and the United Kingdom (about $65 billion).

Ukraine’s military strength, however, lies in the size of its army, and the quantity of military hardware at its disposal.

Ukraine, for example, currently operates more than 2,800 tanks—compared with 423 in France, 407 in the U.K., and 408 in Germany.

And Ukraine’s arsenal comprises 625 multiple launch rocket systems—compared with 44 in France, 42 in the U.K., and Germany’s 50.

Yet, while Ukraine maintains a numerical advantage over other European nations in terms of troops and conventional weapons, its military needs to modernize. Much of Ukraine’s arsenal dates from the Cold War.

Arms Race: 

Eastern Europe is rapidly militarizing.

According to Ukrainian military reports, combined Russian-separatist forces in the Donbas now wield about 700 tanks, 1,200 armored vehicles, 1,000 pieces of artillery, and 300 multiple launch rocket systems.

This puts the combined Russian-separatist forces in control of more tanks, multiple launch rocket systems, and artillery pieces than the armed forces of France, Germany, Italy, Spain, and the United Kingdom.

Among EU countries, only Poland controls more tanks than combined Russian-separatist forces possess in the Donbas.

According to Ukrainian military reports, as well as reports from civilian intelligence firms, there are about 1,500 to 5,000 Russian regulars currently operating in the Donbas in tandem with a separatist force of about 40,000 troops.

Russia also has about 55,000 military personnel forward deployed to bases on the Ukrainian border, Ukraine’s military said.

Russia has also built up a heavy military presence in Crimea. The Ukrainian military says Russia has about 45,000 military personnel inside the occupied peninsula.

Since 2010, Russian military spending has gone up by 80 percent, according to NATO.

Russian military spending surged by 28.6 percent in 2015 alone. Russia’s initial 2016 military budget called for an 8 percent reduction in overall military spending, but a late budget addition this year boosted overall military spending to about 3.89 trillion rubles (about $62.4 billion)—a 14 percent jump from 2015 spending, in real terms, according to a NATO report published on the alliance’s website.

Russia is about midway through a 10-year military modernization project, called the State Armaments Program. From 2010 to 2020, the Kremlin’s military overhaul project plans to spend 19 trillion rubles, about $647 billion at the average exchange rate in 2011, across all branches of the Russian armed forces.

Despite a 3.7 percent fall in GDP in 2015, and a projected 0.8 percent decline this year, Russia is still on track to meet 17.5 trillion of its pledged 19 trillion rubles for the overhaul.

Russia’s military adventures in Ukraine rattled the former Soviet countries of Latvia, Lithuania, and Estonia—all NATO members. Military spending across the Baltic countries has consequently surged.

In 2020, the combined defense budgets of Estonia, Latvia, and Lithuania are projected to have increased by 226 percent over 2005 levels—from $930 million to $2.1 billion.

Latvia and Lithuania have had the two fastest growing defense budgets in the world since 2014, according to IHS Jane’s. And by 2018, the three Baltic states will have each doubled or tripled their budgets from 10 years ago, said Craig Caffrey, principal analyst at IHS Jane’s.

“This growth is faster than any other region globally,” Caffrey said.