Taipei, Taiwan (CNN) The Chinese government has slammed Washington for engaging with Taipei and ordered the Trump administration to cease diplomatic engagements with the island, after a highly unusual public meeting between top officials from the US and Taiwan.

In May, US national security adviser John Bolton met with one of Taiwan's top defense officials, National Security Council Secretary-General David Lee , who was visiting the US. Taiwan's official news agency CNA said it was the first meeting between the top security advisers of both governments since 1979 , when Washington severed formal ties with Taipei.

Chinese Foreign Ministry spokesman Lu Kang said Monday that Beijing "deplored and strongly objected" to the meeting and urged the US to stop "having official exchanges or upgrading substantive relations with Taiwan."

Taiwan and China were separated at the end of a bloody civil war in 1949 and officially the US only has official diplomatic relations with Beijing.

"The one-China principle is the political basis for China-US relations," Lu said. "We are firmly against the US engaging in any official contact with Taiwan in whatever form and under whatever pretext.

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