You always protect your own citizens first, then once you're in a position of strength, then you help your neighbor. If you're both in a hole, you have to get out of the hole first before you help your friend out, otherwise you're just both going to be in the hole. Put your mask on before assisting other passengers, etc. So many analogies, but this is very basic behavior and expected. Until a country no longer has a shortage themselves, its only when they have an abundance should they give needed supplies away.