During the Cold War (194791) the Russia-United Kingdom remained in a state of war after the abdication of Emperor Nicholas II.
 They were allies again in World Wars I and II, although relations were strained by the Russian Revolution of 1917. 
 They were at sword's point during the Cold War (194791). 
 The Russian Empire collapsed with the abdication of Emperor Nicholas II and the old regime was replaced by a provisional government during the first revolution of February 1917 (March in the Gregorian calendar; the older Julian calendar was in use in Russia at the time). 
