The head of Nato has urged members to respond to China's rise ahead of a key summit designed to shore up US support for the western alliance.
Nato leaders are expected to issue a statement branding China a security risk after they meet in Belgium on Monday.
Secretary-General Jens Stoltenberg said the summit was a "pivotal moment" for the alliance.
It is US President Joe Biden's first Nato meeting since taking office.
Nato is a powerful military alliance between 30 European and North American countries. It was established after World War Two in response to the expansion of the Soviet Union.
In recent years, the alliance has come under strain as leaders have debated its purpose and funding.
Tensions grew during the presidency of Donald Trump, who complained about his country's financial contributions to the alliance and questioned US commitment to defend European partners.
But in contrast, his successor Mr Biden has sought to reassert American backing for the 72-year-old military alliance.