Some guy just claimed that China is going to buy 40 Mig31, not sure if this is true.
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MiG-31 "Foxhound"
The MiG-31 long-range interceptor was developed from the MiG-25. The
two-seat MiG-31 fighter has more capable equipment, including the powerful
'Zaslon' phased array radar with a range of 200 km. It is claimed that an unit of
MiG-31 can link their radars together, to establish a search pattern --
covering a width of 800-900 km with four aircraft, spaced at 200 km.
Type: MiG-31
Function: fighter
Year: 1983
Crew: 2
Engines: 2 * 15500kg Perm D-30F6
Wing Span: 13.40 m
Length: 22.6 m
Height: 6.1 m
Wing Area: 61.6 m2
Empty Weight: 21825 kg
Max.Weight: 46200 kg
Speed: 3000 km/h
Ceiling: 20600 m
Range: 3000km
Armament: 1*g30 mm