In August 2025, the latest report of the "Global Firepower Index" showed that Russia is still firmly the second military power in the world, while Japan's ranking jumped to seventh due to its arms expansion in recent years. The German military think tank recently threw the argument that if a war broke out in Japan-Russia, Russia could end the battle in a day.Nuclear arsenal, deep land, scientific and technological equipment, external alliances ¨C every detail of the two countries¡¯ game affects the world¡¯s security pattern.

Nuclear deterrence and modern equipment

The Russia-Ukraine conflict has lasted for three years, and Russia's strategic trump card has repeatedly attracted global attention. The number of active nuclear warheads in Russia still exceeds 1710. At the beginning of 2025, Russia's "Salmat" intercontinental missile was officially deployed into the army. It has a range that can cover the world and a single missile is powerful enough to destroy a city. The latest global data shows that Russia's "God of the North Wind" nuclear submarine and the Tu-160M2 strategic bomber form a strategic trinity, making any opponent dare not rashly challenge.

On the surface nuclear-free, Japan actually has world-class nuclear technology and reactor reserves.In June 2024, the Global magazine that Japan has reserves of more than 60 tons of uranium, has 53 nuclear reactors, and has "nuclear threshold capability" at all times.¡£ However, Japan is subject to the legal and international environment, and has not yet taken the step of substantial armed nuclearization.

The comparison of conventional military strength is equally wide. The Russian army has approximately 1.5 million active troops and 2 million reserves. The defense budget in 2025 will exceed US $85 billion for three consecutive years. The Japanese Self-Defense Force has only about 250,000 people, and its land, sea and air forces are highly capable. In 2025, the number of ships of the Japan Maritime Self-Defense Force will exceed 150, ranking third in the world. Large and medium-sized ships generally have served for no more than 8 years, and their technical standards continue to upgrade. The batch service of the F-35 stealth fighter has allowed Japan to occupy the first echelon in Asia in the competition for air superiority.

The quantitative advantage of the Russian military's conventional equipment is still obvious. The total number of tanks and armored vehicles exceeds 30,000, and there are nearly 15,000 artillery pieces. In 2025, the Russian army will replace T-90M main battle tanks on a large scale, with a modernization rate of more than 60%But the deployment of Russian troops in the Far East was dragged by the Ukrainian war, the problem of the aging of the Pacific fleet became increasingly prominent, and the only aircraft carrier "Kuznetsov" was still not fully restored.

Although the Japanese Self-Defense Force is small, its weapons and equipment are world-class. Canglong-class and Taijing-class submarines maintain global leadership in the field of conventional power, and Aegis destroyers, Kong-class missile ships, and Suna-class helicopter carriers perform well in the fields of anti-submarine, anti-missile, and sea control. In 2025, Japanese military giants such as Mitsubishi Heavy Industries and Kawasaki Heavy Industries will simultaneously complete in-depth cooperation with the United States on the F-35B vertical take-off and landing fighter, further enhancing Japan's long-range strike and island defense capabilities.

Resources, geography and the hidden variables of protracted war

The geographical structure and strategic depth of Russia and Japan are in sharp contrast. Russia has a land area of 17 million square kilometers, and its strategic depth is unparalleled. Siberia and the Far East serve as natural buffer zones, giving the Russian army huge advantages in defense and logistical supply. In 2025, Russia's energy exports will reach a new high, and its natural gas and crude oil reserves will be enough to sustain many years of high-intensity operations.

The territory of Japan is only 37,8 thousand square kilometers, with major industrial areas and military bases spread over narrow coastal areas.The latest energy white paper in 2025 shows that Japan's energy self-sufficiency rate is still less than 11%, 90% of oil and natural gas relies on imports, and strategic material reserves are extremely fragile. Once Russian nuclear submarines cut off Japan's sea routes, Japan's industrial system will face the risk of paralysis.

The technological breakthrough of the Russian military anti-missile system and high-speed weapons has doubled Japan's pressure.In 2025, the Russian "high-speed" hypersonic missile from the Far East base to carry out a real-world strike on the analogue targets, in 4 minutes can cover the mainland of Japan, the existing Zeus shield system interception probability is less than 30%.

Japan's defense industry system is highly developed. More than 1,500 enterprises make up a complete military industry chain, which can rapidly expand production on demand during wartime.In recent years, Japan has eased its weapons export legislation, and has actively exported high-end equipment such as shuttle boats and bipartisan aircraft to Southeast Asia.In 2025, according to "Defense News" statistics, the number of Japan's top 100 military industry companies ranked third in the world, second only to the United States and China.

External alliances and local conflicts

In August 2025, Russia's new S-400 air defense system was deployed in the South Chili Islands, and there was a wave of protests in Japan again, but no substantive action was seen.

Once a local conflict breaks out, the Navy will be the winner. The number and performance of conventional submarines of the Japan Maritime Self-Defense Force far exceed that of the Russian Pacific Fleet, and its anti-submarine and anti-ship capabilities lead the world.The Russian Pacific Fleet has had difficulty confronting Japan in offshore battles due to the lack of modern main force ships.In the first half of 2025, Russian troops conducted large-scale exercises around the four northern islands with the intention of showing deterrence, but the outside world generally believes that without the escalation of nuclear weapons, Russia will be difficult to quickly win.

The role of the United States is extremely critical. The US-Japan Security Treaty gives the United States the obligation to assist in defense. In 2025, the size of the US military stationed in Japan will remain at 54,000. The permanent aircraft carrier at the Yokosuka Base will cooperate with the Seventh Fleet to form a strong containment of the Russian Far East. The U.S. Air Force's F-22, F-35 and other elite fighter jets have been deployed in Japan for a long time and have the ability to strike in depth against Russia.

But the United States does not want to be easily dragged into a positive conflict with Russia. Experts generally believe that as long as the conflict does not break the threshold of nuclear weapons, the United States will focus on limited military presence and strategic deterrence.Once Russia uses nuclear weapons, the global security landscape will be completely rewritten and Northeast Asia will become a world-class powder keg. The latest resolution of the U.S. Congress in 2025 once again emphasizes that preventing Japan must be based on avoiding a nuclear conflict as the primary prerequisite.

The protracted consumption of the Russia-Ukraine war has caused differences in the outside world over the Russian military's combat strength. Although Russia has not invested in "trump card" in Ukraine, its deployment of troops in the Far East is limited. The resistance demonstrated by Ukraine also shows that paper data cannot completely determine the outcome of the battlefield, and the unpredictability of war further enhances the vigilance of all parties.

Uncertainty in the future and the cost of game between major powers

Peace in Northeast Asia is far more practical than a conflict between major powers. In August 2025, the authoritative think tank "Stockholm International Peace Research Institute" reported that the probability of a full-scale war between Russia and Japan is extremely low, and both sides know that there is no winner in a nuclear war. Even if Japan has the ability to transcend the "nuclear threshold" with technology, it is almost impossible for it to take the initiative under the pressure of international public opinion and economic sanctions.

Behind the Russian-Japanese military game lies the multiplicity of global energy, technology, supply chains, and international alliances. Russia's resources and geographical depth can support a protracted war, and Japan's high-tech and industrial systems ensure strong counterattack capabilities in the short term.Neither side can easily defeat each other, and modern warfare has long been no longer a simple match for the number of tank aircraft.

If local conflicts are limited to the four northern islands and surrounding areas, Japan is expected to gain tactical advantages in a limited time by relying on the cooperation of its sophisticated navy and the US military. But once the situation escalates, Russia's nuclear forces and territorial depth will deter any opponent. In the latest global military assessment in 2025, the strategic mutual restraint pattern between Russia and Japan is considered to be an "extremely fragile balance."

As a key observer of Northeast Asia, China continues to pay close attention to Japan's military expansion and regional trends ¡£In August 2025, China's Ministry of Defense issued a statement emphasizing that regional peace and stability are superior to any form of military adventureIf a full-scale conflict breaks out in Northeast Asia, the entire Asia-Pacific supply chain and economy will be severely affected, and nations around the world will not be able to cope with the consequences.

Reference: ¡°Japan, where to go? ¨C Japanese Self-Defense Forces Military Equipment and Military-Industrial Potential¡± Defense Science and Technology Industry 2022

Is Japan's Military Strength Enough to Subvert the Asia-Pacific Military Structure? New York Times

Russian Military Forces Global Fire Force website