Japanese carmakers have largely absorbed the cost of US President Donald Trump’s tariffs on auto imports, a move that may undermine the Asian nation’s negotiating power ahead of a July 9 deadline that will see duties rocket even higher.

Negotiations have stalled ahead of next week’s deadline, with some suggesting Japan misjudged the depth of President Trump’s frustration over Tokyo’s policies.

As Tokyo seeks to avert the US' threat to impose tariffs of up to 35 per cent on Japanese goods, Prime Minister Ishiba stressed that Japan, as the biggest investor nation in the US economy, should be treated differently from other countries.