Rubio tweeted: The last 72 hours revealed to the public what was happening for years, unidentified aircraft routinely operating over restricted US airspace
Transport minister Richard Holden said there were likely to be elements in Beijing acting as a hostile state , and the government must be realistic about the threat .
According to the country s defense ministry, there were 18 Chinese army aircrafts and four ships spotted - 11 of which crossed the median line of the contended buffer zone.
The Defence Secretary announced that the UK is to assess the dangers posed by suspected spy balloons. It comes as an unidentified object was shot down in by US fighter jets on Sunday.