Japan's export growth accelerated in August from the previous month, supported by stronger shipments to the United States, in a sign that escalating trade friction between Washington and Beijing has yet to hit Japanese trade.

But the rise in exports to the United States could put Tokyo under pressure from President Donald Trump ahead of bilateral trade talks expected later this month, some analysts say.

Japanese policymakers also worry over the impact on the country's exports as the United States and China dive deeper into a trade war.