When you're the closest neighbor to a country like North Korea, you tend not to put up with a lot of provocative behavior from unfriendly countries. It should be no surprise that there's a huge difference between how the United States and South Korea respond to violations of their airspace. The U.S. will send the most advanced fighters to intercept the perpetrator and escort them back to international airspace.
South Korea comes in guns blazing.
In late July 2019, Russian military aircraft, two Tu-95 bombers and one A-50 airborne early warning and control aircraft, flew into South Korea's air defense identification zone off the east coast of the Korean Peninsula. But the Russians didn't stop there. The A-50 flew closer to South Korea, entering its airspace. In response, the South launched interceptor planes who scrambled into the area firing flares and live ammo at the intruder.
The Russian got the message and quickly evacuated the area – and maybe his pants. But he didn't stay gone for very long. Just a few minutes later the Russian returned to South Korean airspace.
The Russian Tu-95 "Bear" Bomber
Scrambled South Korean fighters again rolled out the red carpet for the visiting Russian A-50, this time with twice as many flares and many, many more rounds fired in the Russian's direction. The Russians, of course, deny all of this.
"If the Russian pilots had identified such a threat to themselves, they would have immediately given an appropriate response," Lt. Gen. Sergei Kobylash told Russian state news media.
Although it's unclear what the "appropriate response" from the Russian fighters might be, the Russians did say their aircraft were flying over international waters and not violating any treaty obligations. Kobylash said the South Korean air defenses scrambled and merely escorted the Russians, but they did it over neutral airspace. He described the South Korean Air Force's actions as "aerial hooliganism."
Russia's A-50 airborne early warning and control aircraft.
No matter what the South Koreans did or did not do in the face of the Russian aircraft, South Korea lives in what has become a rough neighborhood in recent years, with provocations from North Korea increasing in number and in the severity of potential threats, along with a more aggressive China and Russian air and naval forces, South Korea takes its defense very seriously.
South Korea's presidential national security adviser, Chung Eui-yong, told Russia as much, saying another incident will warrant a much stronger response from the Republic. This was the first foreign military violation of its airspace since the 1950-1953 Korean War.