Please read the case fact in the picture and answer the following Questions：

(1) Dose A breach the contract? 

(2) If A breaches, what kind of breach is it?

(3) What remedies could B pursue if A breaches the contract 

(4) Is CISG applicable in the case, and why?

A US company(A) supplies a Chinese company(B) with a critical medical part for B to use in manufacturing medical equipment. Demand for A's parts goes through the roof during the COVID-19 pandemic and B learns through A's online blog post that A is immediately and indefinitely allocating all of its current and future production of the critical part to fulfill a different customer's orders under a more lucrative contract.