Russia claims to have carried out its first joint air patrol with China, but refuses to allow its aircraft to enter South Korean airspace.
According to the Department of Defense, four bomber-fueled bombers patrolled a pre-planned route across the Sea of Japan and the East China Sea.
South Korea said its jets fired torches and fired machine guns when Russian planes entered.
Japan also used combat aircraft, but criticized South Korea.
The alleged attack occurred The controversial Dokdo / Takeshima Islands, which are occupied by South Korea, but also claimed by Japan.
Russian and Chinese bombers and reconnaissance planes have occasionally invaded the zone in recent years. However, this is the first incident of this kind between Russia and Japan South Korea.
What does Moscow say?
The Department of Defense said two of its Tu-95MS strategic missile launchers had brought together two Chinese strategic Hong-6K bombers on the pre-planned "neutral waters" route.
Supported by fighter jets and A-50 and Kongjing 2000 early warning and control aircraft.
At some point, the patrol became a "unit in the air, consisting of a series of aircraft pairs flying within 3-4 km [around two miles] from each other," Lieutenant General Sergei Kobylash said in a televised statement.
Eleven times they were persecuted by foreign fighters, he said.
He accused South Korean pilots of carrying out "dangerous maneuvers" near disputed islands, "crossing with the aviation group and jeopardizing the safety of the flight".
He confirmed that the South Korean jets had fired lock flares.
The patrol was more than 25 km from the Dokdo / Takeshima Islands and accused South Korean pilots of "hooliganism in the air".
He said that Russia complained to the South Korean military about the "illegal and dangerous actions" of its crews.
This first "joint air patrol" with Russian and Chinese long-haul aircraft in the Asia-Pacific region sends a strong signal of the developing military relationship between Moscow and Beijing. This is not yet a formal alliance, but their joint exercises are more extensive and differentiated.
Again, this is a reflection of the increasingly close economic and diplomatic ties between the two countries, which, though still tense, are converging ever closer. By and large, they share a similar view of the world hostile to the liberal democracy of the West, promoting an alternative model that protects its own national sovereignty, and is often prepared to ride past that of others.
This is a big challenge for the US strategy. The nightmare in Washington is an increasingly close relationship between a confident but declining Russia and an emerging China that will overtake the US in the coming years as a technological and economic power.
What does South Korea say?
South Korea's military said five planes flew into the Korea Air Defense Identification Zone (KADIZ) Tuesday around 9:00 am local time (00:00 GMT).
South Korean F-1
The military said it fired 10 torches and 80 machine gun bullets during the alleged first injury.
It said a Russian A-50 aircraft had left the KADIZ and then reentered – to face another 10 South Korean torches and 280 machine gun bullets.
Chung Eui-yong, head of the South Korean National Security Bureau, has raised vehement opposition to the Security Council of Russia, asking the Council to take appropriate action.
"We see the very serious situation and, if it is repeated, we will take even stronger measures," quoted the office of South Korean President Mr. Chung it.
What does Japan say?
The Tokyo government has filed a complaint against Russia and South Korea.
- Profile: Dokdo / Takeshima Islands
The Japanese government said Russia had violated its airspace because it claimed sovereignty over the islands. The reaction of South Korea was extremely regrettable. Cabinet chief Yoshihide Suga said: "Given Japan's sovereignty over Takeshima, it is utterly unacceptable and utterly unfortunate that South Korean military planes have fired warning shots."
Dokdo / Takeshima
- Known as Dokdo (Lonely Islands) in Korea, Takeshima (Bamboo Islands) in Japan
- Occupied by Japan and South Korea but occupied by South Korea since 1954
- Only 230,000 m² in size  Media playback is not supported on your device.
What are these defenses?
An Air Defense Identification Zone (ADIZ) is an airspace that a country wants to monitor for national security reasons. Overseas aircraft should identify themselves before entering an air defense zone.
An ADIZ usually extends well beyond national airspace to provide sufficient warning of a potential threat.
But ADIZs are not subject to international law, and self-defined borders can be contentious or overlap with other countries' claims, which can lead to violations. This is the case in the East China Sea region, where South Korea, China and Japan have overlapping ADIZs.
Meanwhile, under UN conventions, countries control the airspace over their territory and territorial waters (up to 12 nautical miles from the coast)).
In this case, South Korea said Russia had penetrated beyond its ADIZ into the territorial airspace surrounding the islands.
But other nations do not recognize South Korea's sovereignty claim.