Taiwan invasion unlikely for now - but there are other ways China can turn the screw

The good news is that there are only five months when weather conditions are good enough to mount an invasion of Taiwan, according to Ian Easton, the author of The Chinese Invasion Threat.

The bad news is that two of them are April and May.

So when Taiwan reported that 25 Chinese air force aircraft, including nuclear-capable bombers, entered its air defence identification zone (ADIZ) this week, fears of attack are front of mind.

It was the largest incursion by the Chinese military to date.

US Admiral Philip Davidson - Washington's top military officer in the Asia-Pacific region - recently said he was worried China could invade Taiwan in the next six years.

Chiu Kuo-cheng, Taiwan's new defence minister, responded: "His evaluation says six years, but my concerns include six hours."

The foreign minister, Joseph Wu, said this month that in the event of an attack Taiwan would fight "to the very last day".

There is belligerence from the Chinese side. A defence ministry spokesperson said that a declaration by Taiwan of independence "means war".

Watch: China deploys jets and bombers into Taiwanese airspace in 'biggest incursion to date'

Hu Xijin, the editor of a nationalistic Chinese tabloid, said that the Chinese military could fly directly over the island of Taiwan itself, and if Taiwan fired at those planes, China would attack.

Hu's attention-seeking provocations should always be taken with a pinch of salt but they show how the conversation around Taiwan is evolving.

But although the intensity is increasing, in many ways we are still in the status quo that has existed for decades.

China's constitution, adopted in 1949, says Taiwan is part of its "sacred territory" and details the "inviolable duty" of "reunifying the motherland".

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On the question of "Taiwan independence", China as far back as 2005 passed a law that formally authorised military force if Taiwan was "separated" from China.

Taiwan has its own constitution and a highly functioning democracy - rated above Japan and South Korea by the Economist Intelligence Unit.

The election of President Tsai Ing-wen in 2016 led to an escalation in pressure from China. What we're seeing now is best viewed as the latest development in that continuous period.

And as China has increased its attrition strategy, the US has increased its ties with the island, which in turn leads to more Chinese pressure.

That pressure is designed to take a psychological and logistical toll on Taiwan.

In 2020, Taiwan spent some $900m scrambling fighters to meet Chinese sorties and said it would no longer dispatch jets to meet every incursion, instead tracking Chinese aircraft with land-based missiles. Expect that pressure to continue.

But a full-scale invasion by China remains unlikely in the short term. That would require a massive build up of forces, easily detectable by US and Taiwanese monitoring.

There are options short of invasion that are still worrying.

China could blockade the island economically, or seize some of its outlying territory. The Kinmen Islands, administered by Taiwan, are barely a mile from China.

Any such move would be a test of the US resolve to defend Taiwan, perhaps analogous to Russia's seizing of the Crimean Peninsula.

Would an aggressive Chinese move, short of full invasion, prompt the US to respond militarily?

Right now, no one knows. That means it would be hugely destabilising.

For all the pressures of the current moment, it at least fits a known, established pattern - and is far preferable to an escalation, the consequences of which would be difficult to predict.

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