Israel is a rogue nuclear state and has refused to join the regulatory bodies like the other nuclear powers. Therefore, Israel has no right to criticize North Korea. Israel is only criticizing North Korea in an attempt to legitimize its own nuclear arsenal and sound like a legitimate state. Israel is rogue state that is engaged in all sorts of illegal activities including its nuclear program. The world is increasing aware of this thanks to remarkable newspapers like Haaretz.
from the article: Israel urges 'swift' world response to North Korea nuclear test