Factbox-NATO's plan to vastly increase combat-ready forces to counter Russia

British Prime Minister Boris Johnson, U.S. President Joe Biden and NATO Secretary General Jens Stoltenberg attend the round table of a NATO summit in Madrid, Spain June 30, 2022. REUTERS/Yves Herman

MADRID (Reuters) - NATO leaders have agreed to put over 300,000 troops on high alert from mid-2023, up from 40,000 currently, to counter Russia, the country designated by the alliance as posing the greatest threat over the next decade.

Here are details of the current force "posture" and the plans to update it to deter any future Russian attack on NATO's eastern flank, as well as to react to other crises on the alliance's southern borders.