Red lines in the Russo-Ukrainian War

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The term red lines has seen use in the Russian invasion of Ukraine in 2022, and is a veiled threat of engagement that is intended to warn an opponent or observer not to interfere or undertake in an action or behaviour that would "cross the red line."

On 21 April 2021, Russian President Vladimir Putin made a speech in which he repeatedly warned the West of red lines that Russia would not accept. The warnings were repeated on many occasions up to the date of the Russian invasion of Ukraine on 24 February 2022.^[1]

To some experts, the number of red lines that have been crossed reveal the inability for belligerents involved in the war to project power internationally.^[2]