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The Trump administration on Thursday notified the US Congress of its plan to approve the sale of a $1.4 billion arms package to Taiwan. The plan, which requires Congressional approval, would be the first such sale under President Donald Trump.

The package reportedly includes torpedoes, missiles and early-warning radar support but does not include the F-35 fighters that the island's new administration desires.

Arms sales to Taiwan have long been a serious issue in the China-US relationship. Sales of defensive weapons are a key provision of US commitments to Taiwan under the Taiwan Relations Act. Although China has strongly condemned the US whenever such sales were made, the US has gone on its own way under each administration and has even made multiple arms deals with Taiwan during a particular presidential tenure. The scale and quality of arms package the Trump administration has just approved is of a medium level among all deals so far.

It must be noted Beijing's diplomatic protest along with some boycott actions have each time yielded noticeable results. Beijing's reaction has no doubt exerted pressure on Washington, which has to be more cautious as it lays out the plan of arms sales to Taiwan. The scale of arms sales to Taiwan normally would not be upgraded significantly under a new administration although a new president is not willing to scale back either. Washington is extremely cautious about whether to sell Taiwan the offensive weapons the island is desperate for. The quality of weapons that the US has sold to Taiwan is lower than that of weapons sold to its other major allies.

With the mainland's growing military might, the military strength of the mainland and Taiwan is already out of balance. With only the defense spending of around $10 billion a year, less than one-tenth of the mainland's military expenditure, Taiwan's army has been dwarfed to a level of "militia" compared with its mainland's counterpart and has lost the substantial resistance capability. The annual increase of the mainland's military spending is almost equal to the island's total annual military spending. Additionally, the mainland has continuously developed new cutting-edge weapons. As time goes by, it would be increasingly an easy game for the mainland to recover Taiwan by force.

In this light, US arms sales to Taiwan is more of a political than a military issue. Arms sales are one of the key elements of Washington's military and political engagement with Taiwan and signals Washington's reiteration of its commitment to protecting Taiwan. It is also a card Washington holds against the mainland. By adjusting the scale and timing of arms sales, Washington tries to send clearer signals to Beijing.