How many cutters do the Japanese have and many of these cutters are heavily armed. And how many aircraft in Japanese coast guards units did the Japanese have? And how many of China's cutters are heavily armed or armed at all for the matter?
Japanese CG has got about 50 1,000+ ton cutters.
Shiretoko class (1200 t, mostly armed with 20mm machine gun x 1, 20 knots) - 10
Oki (1500 t, 20 mm machine gun x 1, helipad, 20 knots) - 1
Erimo class (2000 t, 20 mm machine gun x 1, 35 mm Oerlikon gun x 1 on 6 cutters of the class, helipad, 20 knots) - 7
Hateruma class (1300 ton, 30 mm Bushmaster II x 1, helipad, 30+ knots) - 9
Kunigami class (1700 t, 20 mm machine gun x 1, helipad, 23+ knots) - 2 in service + 10 coming in the next two years. They will form the so clalled 'Senkaku squadron'
Iwami class (1250 t, 30 mm gun (I suspect Bushmaster II) x 1, 21+ knots) - 2 constructed + 4 coming in the next years
Hida class (1800 t, 40 mm Bofors Mk3 x 1, 20 mm RFS mg x 1, helipad, 30+ knots) - 3
Kojima (3200 t, 35 mm mg x 1, 20 mm mg x 1, 12,5mm mg x 1, helipad, 18 knots) - 1, for training puproses
Miura (3200 t, 20 mm mg x 1, 18 knots, helipad) - 1
Izu (3800 t, 20 mm mg x 1, 21 knots, helipad) - 1
Soya (4000 t, 40 mm Bofors x 1, hangar for 1 helicopter, 21 knots) - 1
Tsugaru class (4000 t, 40 mm Bofors/35 Oerlikon x 1, 20 mm mg x 1, hangar for 1 helicopter, 23 knots) - 9
Mizuho class (5300 t, 35 mm Oerlikon x 1, 20 mm mg x 1, hangar for 2 helicopters, 23 knots) - 2
Shikishima class (7100 t, 35 mm double mg x 2, 20 mm mg x 2, hangar for 2 helicopters, 25+ knots) - 2