US President Donald Trump lashed out at China Wednesday, pointing to a surge in its trade with North Korea as evidence that US reliance on Beijing to rein in Pyongyang was misplaced.

“Trade between China and North Korea grew almost 40% in the first quarter. So much for China working with us – but we had to give it a try!” Trump said in an early morning tweet.

Trump also posted that he was about to depart on a trip to Europe that will include a meeting with China’s President Xi Jinping at a G20 summit in Germany.

It came a day after North Korea conducted an apparently successful test launch of an inter-continental ballistic missile capable of striking the United States.

Trade between China and North Korea grew almost 40% in the first quarter. So much for China working with us - but we had to give it a try!

— Donald J. Trump (@realDonaldTrump) July 5, 2017

Getting ready to leave for Poland, after which I will travel to Germany for the G-20. Will be back on Saturday.

— Donald J. Trump (@realDonaldTrump) July 5, 2017

The United States made some of the worst Trade Deals in world history.Why should we continue these deals with countries that do not help us?

— Donald J. Trump (@realDonaldTrump) July 5, 2017