Cyberattacks against allies of the North Atlantic Treaty Organization (NATO) is one of the priorities to be addressed at a summit next week in Brussels, NATO Secretary General Jens Stoltenberg said in Washington on Monday.

"We see more frequent and we see more sophisticated cyberattacks against NATO Allies, also the United States," Stoltenberg said after meeting with US president Joe Biden at the White House.

Stoltenberg also cited Russia for having used "military force against neighbors" and also China for "intimidating neighbors [and] undermining freedom of navigation."

In addition, he stressed that China "will soon have the biggest economy in the world. They already have the second largest defense budget, they are investing heavily in new modern capabilities, they have the biggest Navy in the world. And they don't share our values."

Before his meeting with Biden, Stoltenberg visited the Pentagon to meet with the US Secretary of Defense General Lloyd Austin.