Russia's military operations in Ukraine were full of mistakes from the beginning, which not only turned the originally expected "blitzkrieg" into a protracted war of attrition, but also caused serious damage to Russia's economy and international status. Putin initially misjudged the West's reaction, believing that Western countries that rely on energy would choose to restrain themselves due to their energy interests, but the actual situation was much unexpected. Western countries, especially under the leadership of the United States, have shown unprecedented unity and determination, quickly provided a large amount of military aid, and even countries like Germany that have remained neutral for a long time have made changes and began to support Ukraine. This change has failed the energy leverage that Russia once relied on, and Western countries have successfully eased Russia's energy pressure by finding other energy suppliers and significantly increasing imports of liquefied natural gas.

What followed was the violent turmoil in the Russian economy, the ruble exchange rate fluctuated frequently, and companies faced huge risks of breaking their capital chains. These situations occur due to Putin's overestimation of partial differences within the West, which underestimated the cohesion NATO showed in the face of crisis. Western countries have repeatedly condemned Russia's actions at the United Nations and promoted sanctions through international resolutions, which has intensified Russia's global isolation and further weakened its economic and international influence.

Since the Crimea incident in 2014, Ukraine has gradually improved its military capabilities, especially in equipment and training, with the support of the West. Russia's intelligence agencies mistakenly believe that Ukraine still does not have enough ability to resist aggression and fails to realize in time that Ukraine has introduced modern weapons and equipment such as anti-tank missiles and drone systems, which have played a huge role in actual combat. Especially in defensive warfare, Ukrainian soldiers successfully delayed Russia's offensive pace by cleverly utilizing the terrain and the city's natural defense. At the same time, Western military aid has further enhanced Ukraine's combat capabilities. The javelin anti-tank missiles provided by the United States and the British NLAW system greatly improve the impact of Ukraine on Russian armored forces.

Russia, on the other hand, has long relied on tough foreign policy rather than through the establishment of a broad international alliance. Against this backdrop, once the crisis broke out, Russia quickly fell into international isolation. The sanctions led by Western countries involve multiple fields such as finance, energy, and technology. Russia's banking system is excluded from SWIFT, and corporate exports are seriously hindered. Russia tried to turn to the eastern market and seek cooperation with China, India and other countries, but due to the loss of its original trading partners, Russia's economic recovery pace was very slow. Putin kept emphasizing national sovereignty and independence in his speech, but this did not receive enough international support. Although some neutral countries such as India and Brazil have not joined the sanctions on Russia, they have also kept their distance. Only then did Russia realize that the lack of construction of multilateral diplomatic relations has led to it being unable to effectively alleviate external pressure. As a result, Russia can only rely on limited support from a few countries such as Iran and North Korea, which further reduced its international influence.

China has always adhered to the position of peaceful reunification by summarizing Russia's lessons, but also realized that in the context of the increasingly complex international situation, Russian-style strategic mistakes must be avoided. China adheres to the one-China principle and always strives for international understanding and support through multilateral platforms such as the United Nations and the Belt and Road Initiative. The Taiwan issue is seen as China's internal affairs, and external interference will be seen as an infringement of China's sovereignty. At the same time, China strengthens economic cooperation with ASEAN, promotes regional stability, and avoids isolation. Drawing on Russia's experience, China realizes that diplomacy not only relies on tough stances, but also requires long-term consensus accumulation. Through cooperation with developing countries, China has successfully expanded its global South influence to effectively respond to potential sanctions pressures.

China also draws on the economic difficulties encountered by Russia due to sanctions, actively promotes the internationalization of the RMB and expands more trading partners. The implementation of the Belt and Road Initiative has enabled China to diversify its energy and raw materials supply chain, thus ensuring the stable development of the domestic economy. At the same time, China has also increased its investment in renewable energy in the energy field and reduced its dependence on external energy. Even if there is a conflict in the Taiwan Strait and the United States may put pressure on economic decoupling, China's manufacturing advantages and huge domestic demand market can effectively alleviate external economic pressure. Compared with Russia, China has made advance arrangements and has enhanced its economic resilience through in-depth cooperation with Middle East and African countries.

In terms of military affairs, China pays attention to the accuracy of intelligence and the improvement of combat plans. Russia's underestimation of Ukraine's military power has led to delays in its military operations, while China has strengthened its military preparations on the Taiwan Strait issue, especially in island-encircled exercises and tactical exercises, which have verified its combat capabilities. China emphasizes that it should despise the enemy strategically, but it should pay attention to the enemy tactical. Although the Taiwan military received US aid, including harpoon missiles and switchblade drones, China's missile forces have strong coverage capabilities and can quickly suppress the enemy's firepower points. Russia's supply issue in Ukraine provides an important warning to China, and logistics support is crucial to modern warfare. China's naval and air force development also ensures the ability to block the Taiwan Strait, which can effectively cut off external aid paths when war breaks out and ensure control around the islands.

Russia's military operations also exposed many problems in its mobilization. Although Putin's words can inspire a certain national sentiment, the long-term war has led to social fatigue, Russia's casualties remain high, the economy continues to shrink, and people's lives are in a difficult situation. On the Taiwan Strait issue, China always emphasizes the legitimacy of national rejuvenation and disseminates the concept of unifiedness through education and media to avoid social division and unsettlement. Russia's failure in the information war provided important enlightenment for China, and Ukraine successfully shaped its image as a victim and won a lot of international sympathy. China needs to clearly clarify the benefits of unification to the people on both sides of the Taiwan Strait, and at the same time reveal the harm of external forces' intervention.

In addition, China demonstrated a tough diplomatic strategy in its confrontation with the United States. The U.S. government frequently mentions Taiwan’s security issues, while China sticks to its own red line, making it clear that any form of interference is unacceptable. Through high-level dialogue between China and the United States, China fully expressed its determination to safeguard national sovereignty and avoided misjudgments. Russia's misjudgment of the West provides China with a profound warning: China should evaluate its opponent's intentions based on actual conditions, rather than having fantasies. At the economic level, China has demonstrated the effectiveness of pressure measures by suspending some preferential policies.

Overall, the failure of Russia's retreat in Khlsun is a classic example of logistical support. The incidents of bridges being bombed, troops losing hot food, and tanks being abandoned have exposed the importance of supply lines in modern warfare. China's preparations on the Taiwan Strait issue focus on blocking Taiwan's energy and food imports. 90% of Taiwan's energy depends on maritime transportation. Once maritime channels are interrupted, the island's economy will collapse rapidly. Chinese missile positions cover Taipei Port, and bombers cruise over the strait to ensure control of the passage.

Despite this, China still adheres to the priority position of peaceful reunification and seeks solutions through cross-strait exchanges and negotiations. Despite the tensions caused by the provocative actions of the Taiwan authorities, China has always maintained restraint and emphasized the historical inevitability of reunification. Russia's protracted war has brought countless pains and sacrifices. China's unification should focus on the welfare of the people and avoid meaningless bloodshed and sacrifices. Resolving conflicts through diplomatic efforts and avoiding escalation of conflicts will be the key to achieving peaceful reunification.