GENEVA (AP) — Following intense pressure from its allies, Germany appears to be inching toward approving deliveries of high-tech Leopard 2 main battle tanks that Ukraine and its biggest Western backers hope will boost Kyiv’s fight against Russian invaders.

Over the weekend, German Foreign Minister Annalena Baerbock said Berlin would not get in the way if Poland — arguably Ukraine’s most vocal supporter among European Union neighbors — wants to ship Leopard 2 tanks from its arsenal across the border into Ukraine. And Germany is not ruling out supplying such tanks to Ukraine itself, cautioning however that the implications of such a step need to be carefully weighed.

Here’s a look at what those tanks might mean for Ukraine’s defense against Russian forces — and hopes for driving them out.

WHAT IS THE LEOPARD 2?

Germany’s Krauss-Maffei Wegmann, the manufacturer of the Leopard 2, touts it as “the world’s leading battle tank” that for nearly a half-century has combined aspects of firepower, protection, speed and maneuverability, making it adaptable to many types of combat situations.

The 55-ton tank has a crew of four and a range of about 500 kilometers (310 miles), and top speeds of about 68 kilometers per hour (about 42 mph). Now with four main variants, its earliest version first came into service in 1979. Its main weapon is a 120mm smooth bore gun, and it has a fully-digital fire-control system.

HOW MANY COULD BE SENT TO UKRAINE?

One big appeal of the German-made tanks are their sheer number: More than 2,000 have been deployed in over a dozen European countries and Canada. Overall, Krauss-Maffei Wegmann says over 3,500 units have been supplied to 19 countries.

Rheinmetall AG, a German defense contractor that makes the 120mm smoothbore gun on the Leopard 2, says the tank has been deployed by “more nations than any other.”

According to a recent analysis by the International Institute for Strategic Studies, a London-based global think tank, some 350 Leopard 2s — in different versions — have been sent to Greece, and Poland has about 250 of varying types. Finland has 200 in operation or in storage.

For Ukraine’s war against Russia, “it is believed that for the Leopard 2 tanks to have any significant effect on the fighting, around 100 tanks would be required,” the International Institute for Strategic Studies analysts wrote.

Ukraine’s defense minister wants 300 tanks, and some European Union leaders support him on that.

“We need a fleet of 300 tanks,” Luxembourg’s Foreign Minister Jean Asselborn said Monday in Brussels, alluding to the wide deployment of Leopards across Europe and the need for “synchronous” weaponry — that can operate smoothly together.

Getting Leopards into Ukrainian hands isn’t as easy as rolling them across the border from friends farther West in Europe. The International Institute for Strategic Studies estimates that three to six weeks of training would be needed for operating crews and support staff to reach basic proficiency.

Ralf Raths, director of the Panzer Museum in Munster, Germany, said experienced Ukrainian tank crews would likely be able to learn to use the Leopard 2 fairly quickly, and training could be shortened to focus on essential knowledge.

“Do you really have to exploit 100% of the potential or is it enough to utilize 80% in half the time? Ukrainians will certainly vote for option B,” he said.

WHAT DIFFERENCE WOULD IT MAKE TO THE WAR?

Yohann Michel, a research analyst for defense and military affairs at the International Institute for Strategic Studies, said such tanks could allow Ukraine to go onto the offensive in the 11-month-old conflict that has been stalemated for months following two key Ukrainian counteroffensives that recaptured areas occupied by Russian forces for months in the northeast and south.

“In this type of conflict, it’s just not possible to carry out large-scale offensives without the full variety of armored combat equipment and armored vehicles, and tanks are a part of that,” he said. In addition to Main Battle Tanks, or MBTs, like the Leopard 2, others include infantry fighting vehicles and armored personnel carriers.

Western deliveries of Leopard 2s could help equip Ukraine with needed high-caliber munitions to replace its own dwindling Soviet-era stockpiles, opening a new avenue for supplies of Western firepower to get to Ukraine, he said.

Raths noted that the Leopard 2 and similar Western tanks are more agile than T-models used by Russia, which can’t reverse at speed, for example.

“Imagine a boxer who cannot move freely in the ring, but only in one direction,” he said. “The other boxer, who can move in all directions, has a big advantage and that it is the case with the Leopards.”

Still, even Western MBTs are vulnerable to aerial attacks, or anti-tank infantry while in forests and urban areas, highlighting the importance of anti-aircraft and reconnaissance support, said Raths.

With similar numbers of tanks on both sides, Leopards 2 and similar tanks could give Ukraine the upper hand, especially given the poor tactical performance of Russian troops during the war, he said.

“The Ukrainians shine through creative, dynamic and often very clean warfare,” Raths said. “So it could well be that if Ukraine’s operational offensive were to begin, the Russians would have real problems countering it.”

Niklas Masuhr, a researcher at the Center for Security Studies at Switzerland’s federal polytechnic university ETHZ, based in Zurich, cautioned that the addition of Leopards to the battlefield alone wouldn’t be “a game changer or a war-winning technology, anything like that.”

“You can’t just deploy a bunch of main battle tanks and assume they will win,” he said. “They’re very valuable, but you still need to use them in the correct way and integrate them with all the other military tools that you have at your disposal,” such as infantry, artillery, air defense, combat engineers and helicopters.

WHY DOESN’T UKRAINE HAVE LEOPARDS ALREADY?

Germany has final say about whether Leopard 2s can be delivered — even from other countries’ arsenals — and has been reticent about anyone shipping them to Ukraine.

More-hawkish Western allies have been stepping up the pressure on Germany, but the United States has also refused to send its powerful M1 Abrams tanks.

The United States announced an upcoming new package of military aid that is expected to include nearly 100 Stryker combat vehicles and at least 50 Bradley armored vehicles — but not the Abrams, which U.S. officials say has complex maintenance needs and may not be the best fit.

Allies and military analysts say the Leopard 2 is diesel-powered — not driven by jet fuel that powers the M1 Abrams — and is easier to operate than the big U.S. tanks, and thus has shorter training times.

Britain this month announced it will send Challenger 2 tanks to Ukraine, and the Czech Republic and Poland have provided Soviet-era T-72 tanks to Ukrainian forces. French President Emmanuel Macron said Sunday that he had asked his defense minister to “work on” the idea of sending some of France’s Leclerc battle tanks to Ukraine.

Even if modern western MBTs are superior to their Russian counterparts, donor countries supplying them need to prepare for losses, Raths said.

The Leopard 2 “is an offensive weapon that will be thrown into high-intensity battles,” he said. “Vehicles will be destroyed, and people will die in these tanks.”

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Jordans reported from Berlin.