Russia's choice of fighter jet to probe NATO's airspace could have some indication as to its intentions. An evolution of the MiG-25, the MiG-31 is billed as an interceptor jet with a top speed exceeding 1,800 miles per hour. Notably, its top speed is much higher than that of the F-35 Lightning II jets that were scrambled to intercept. A much closer NATO analog to the MiG-31 would be the F-15 Eagle or F-15 Strike Eagle, which has a top speed of 1,875 miles per hour. Still, the mere presence of supersonic Russian interceptors in NATO airspace is worrying enough to the point that some NATO countries, like the Czech Republic, even advocated for shooting down Russian jets the next time something like this happens.