Trump can't seem to work out his feelings towards China.

The порнография молодыефранцуженкиU.S. president attacked China on social media, just a day after North Korea tested out a ballistic missile that it claims can reach as far as the U.S.

"I am very disappointed in China...they do NOTHING for us with North Korea," he posted in a series of tweets on Saturday.

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Just a month ago however, Trump had posted tweets to a different tune, saying he "greatly appreciated" China's efforts to help out with North Korea.

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Trump's latest tweets also come in direct contrast to the statements he made in April, where he said that he realised it was "not so easy" for China to negotiate with North Korea.

"After listening [to Mr Xi explaining the history of China and Korea] I realised it's not so easy," Trump told the Wall Street Journalduring President Xi's visit to his Mar-a-Lago estate.

"I felt pretty strongly that [China] had a tremendous power over North Korea. But it's not what you would think."

But if you look back just a little over a year ago, Trump was pretty disdainful towards China.

In March 2016, he accused China of doing "little to help," and "playing the U.S. for years."

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Later in December 2016, he came out, guns blazing, criticising China's monetary policy.

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Those tweets were widely cited in Chinese media, and the White House had to reassure the Chinese government that the U.S. did not mean to undermine China.

Experts: Don't look to China

According to some experts, Trump is going to remain disappointed if he continues to count on China to mediate for peace with North Korea.

Ben Rhodes, a foreign policy adviser under Barack Obama, took to Twitter to express his views, replying to Trump's tweet:

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Another analyst also agrees with Rhodes.

"Don't look for the Chinese to help us on North Korea," Harry Kazianis, director of defence studies at the Centre for the National Interest, a DC think-tank, told CNBC.

"If you look at it from the Chinese eyes, they are probably actually more scared of North Korea than we are."