Zbigniew Brzezinski, national security adviser to President Jimmy Carter, has died at the age of 89.
His death was announced by his daughter on social media.
Born in Warsaw and educated in Canada and the US, Brzezinski is credited for helping to topple economic barriers between the Soviet Union, China and the West.
He also played a key role in brokering the 1978 Camp David Accords, the framework which led to peace between Israel and Egypt.
When Soviet troops invaded Afghanistan, Brzezinski also strongly backed the arming of Afghan rebels in response.
In a statement, President Carter described Brzezinski as brilliant, dedicated and loyal.