US and Canada track Chinese and Russian long-range bombers off Alaska

A long-range bomber of the Chinese air force is escorted by a Russian Su-30 fighter (Russian Defence Ministry Press Service via AP)

Two Chinese and two Russian long-range bombers have been tracked flying over international waters near Alaska, and US and Canadian fighter jets were sent up in response, their joint aerospace command said.

The Chinese and Russian military activity on Wednesday was not seen as a threat, said the North American Aerospace Defence Command (Norad).