For Protagon it's unacceptable that Tsipras failed to give Kotzias the backing he needed:

“It took three years for a minister in this government to act in a normal way, for a minister who felt left in the lurch by the prime minister to step down. That's the right reaction. That's what Nikos Kotzias had to do, and luckily that's what he did. The sad thing is that this resignation has taken place with Defence Minister Panos Kammenos laughing over it. And even sadder is that Alexis Tsipras has become so politically short-sighted. ... Kotzias, who hasn't done anything wrong, has resigned. Kammenos, who has repeatedly disgraced himself [among other things because he rejects the agreement on the name conflict], remains in office.”