Thanks for this one John, Stephen Dziedzic has this for you:
"I’ll paraphrase Tony Jones here – “I’ll take that as a comment!” It’s certainly hard to imagine any country on the planet launching a full-scale invasion of China, although it’s worth noting that in recent years there have been several violent flare-ups between India and China along their Himalayan border.
Beijing likes to point out that the United States maintains a vast network of overseas military bases, including in several countries near China (including in South Korea and Japan) and in the US island territory of Guam.
China argues that the US is trying to encircle or “hem in” China with these bases. And of course Beijing has engaged in a massive military build up not just because it wants to equip itself with the forces it would need to seize Taiwan, but also to give itself the capacity to defeat US forces in the region in the event they come to Taiwan’s aid.
More broadly, China has also made it clear it does not want the US to maintain a military presence in Asia – as Xi Jinping once said, “it is for the people of Asia to run the affairs of Asia, solve the problems of Asia and uphold the security of Asia.”
But several other Asian nations are uneasy about the prospect of Chinese military hegemony in the region and would like the US to stay in the region in order to maintain a strategic balance, however uneasy.
How will all this play out? You’d be brave to make any confident predictions. But expect China to press ahead full speed with military modernisation and expansion under Xi Jinping."