European Commission president Jean-Claude Juncker went public on Friday with his frustration for none other than Greek PM Alexis Tsipras, as the latter was in St. Petersburg brushing up on his BRICS credentials and talking energy deals with Vladimir Putin.

“I don’t understand Tsipras,” Juncker was quoted by the German weekly Der Spiegel as saying.

“The trust I placed in him has not always been reciprocated in kind.”

Juncker disclosed that the Commission had offered the radical leftist government now running Greece an investment program worth 35 billion euros for the 2015-20 period, an option that garnered nary a response, as he said.

“If I were the Greek prime minister I would claim that as a success, but I’m hearing nothing about it.”

He also said he could no longer rule out Greece’s leaving the eurozone.