As the war at Lay Kay Kaw in Kayin State, Myanmar, intensified, some analysts linked it to Pearl Harbor in Hawaii, arguing that the entire KNU was as if the United States had been drawn into World War II.
The 6th Brigade of the KNLA also participated in the fighting after burmese invasions of the Japanese consortium in February 2015 to fund the construction of the peace-symbol Regga, while until then only the 5th Brigade of the Karen National Liberation Army fought the Burmese army alone, the 1st Brigade only occasionally attacked the Burmese army, and the 6th Brigade was in a completely non-war state, but since the Reggaux War in mid-December 2021, the Karen National Union has ordered all troops to fire.
Some observers see the Reggaux manhunt as Pearl Harbor and are watching to see if the Karen National Coalition, which has been slammed for appeasement, will be as involved in World War II as the United States was. When the Burmese military coup d'état occurred, the Karen National Union issued a statement at the first time saying that it could not accept the military coup, but unlike the Kachin Independence Organization/Kachin Independence Army (KIO/KIA), the Kayer National Progressive Party/Kayer Army (KNPP/KA) and the Chin National Front/Chin National Army (CNF/CNA), not all the brigades of the Karen National Liberation Army counterattacked the Burmese army, only 5 brigades of the 7 brigades carried out several military operations, and 1 brigade had some conflicts with the Burmese army.
Some leaders of the Karen National Union want to follow the National Ceasefire Agreement (NCA) route, which has been fighting burmese forces since Burma's independence, and myanmar launched two major offensives against the Karen National Union in 1988 and 1995, leaving more than 3,000 villages in Kayin State on fire and more than 150,000 refugees fleeing to Thailand. By January 12, 2012, Mutu Say Poe, then commander-in-chief of the Karen National Liberation Army, signed a provincial-state ceasefire with Thein Sein's government, ending more than 60 years of civil war. At that time, representatives of the seven brigades held a secret ballot, and two brigades supported the five brigades against it, so Mutusipo signed a provincial-state ceasefire agreement without reporting to the president of the Karen National Union.
Subsequently, with Mutusipo's election as chairman of the Karen National Union, most of the fighting in the Karen National Union-controlled areas gradually subsided, and on October 15, 2015, the National Ceasefire Agreement was signed with the Wu Thein Sein government. During his presidency of the Karen National Union, Mutusi wanted the entire karen state to be in a ceasefire, so since he took over as chairman, some brigades of the Karen National Liberation Army have not recruited new recruits to expand, so Mutusi is willing to continue to follow the NCA route despite his opposition to the military coup. On the other hand, the Karen National Union has been sheltering those who fled to its control areas after the military coup and even training the People's Defence Forces (PDF) in some places, which led to the Burmese invasion of karen national union-controlled areas and attacks on people's defense camps, which the karen national union reacted to, but was generally reclusive because it did not want to go to war.
In addition to fighting in the Leggau area, there were also fighting in Kaugali, and Burmese reconnaissance aircraft flew in the town of Papen, where the 5th Brigade of the Karen National Liberation Army was active, and in the town of Mumbang Birin, where the 1st Brigade was active. The Karen National Union is still fighting the Burmese forces in Regga and Gorgali, but many high-level officials find it difficult to accept the excessive use of force by the Burmese army, and at most 3 mobile divisions of the Burmese army attacked Reggao and Galgal, resulting in the displacement of more than 10,000 people, some of whom fled to Thailand. It is unacceptable that some Karen forces in Karen State, such as the Karen Border Guard (BGF), are being used by the Burmese army to attack the Karen people, and many Karens in Myanmar are demanding retaliation against the Burmese army, while those overseas Karen are also helping.
The Karen National Union has a sufficient number of troops and has good relations with the Popular Defence Forces under the Government of National Unity (NUG) and can arm many Popular Defence Forces if the Karen National Union provides weapons. The Karen National Union has also received a lot of help internationally, and many Karens also support the Karen National Union, in which case if the Karen National Union does not resist the invasion of the Burmese army, the Karen support for the Karen National Union may decline, and the Karen National Union leaders are aware of this situation.
For these reasons, the war sparked by Leggau could eventually spread to 7 brigades of the Karen National Liberation Army. The Burmese army is currently fighting nationwide, with losses in fighting in northern Shan, Kayah, Chin and Sagaing provinces, in addition to nearly 3,000 Burmese troops participating in the Civil Disobedience Movement (CDM), some of whom are turning the spearhead to launch an offensive against the Burmese army. In this case, observers argue that if all the KNU brigades fought back against the Burmese army, the current revolution to overthrow the junta could improve, which is why the war that began in Reggaeu could become as interesting as Pearl Harbor.