US President Joe Biden is to urge Western countries to counter China's growing influence at the second day of the G7 summit, an aide told the BBC.
At the meeting in Britain, President Biden is expected to call for a new alliance to rival Beijing's spending on infrastructure in developing countries.
The US and its allies accuse China of forced labour and other human rights abuses in Xinjiang province.
G7 leaders will also commit to a new plan to stop future pandemics.
The measures include cutting the time needed to develop vaccines and treatments for Covid-19 to under 100 days.
UK Prime Minister Boris Johnson is hosting the three-day gathering at the seaside resort of Carbis Bay in Cornwall.
