I don't know about "a bluff" but this happened in mid-2021 and did not precipitate an immediate invasion. > In March and April 2021, Russian president Vladimir

I don't know about "a bluff" but this happened in mid-2021 and did not precipitate an immediate invasion. > In March and April 2021, Russian president Vladimir Putin ordered the Russian military to begin massing thousands of personnel and equipment near its border with Ukraine and in Crimea, representing the largest mobilization since the annexation of Crimea in 2014. This had precipitated an international crisis and generated concerns over a potential invasion. Satellite imagery showed movements of armour, missiles, and heavy weaponry. The troops were partially withdrawn by June 2021.