I see these previous discussions here, others that may be of tangental interest:

• Why did the Russians sell Alaska?: short, pithy, and got a reply "The_Alaskan (Moderator | Alaska) Beaten to the punch. This is correct."
• AMA: Alaska, from Prehistory to Present: The_Alaskan's AMA.
• Why did Russia sell Alaska to the United States?: The_Alaskan wrote, "This question comes up every other month or so, and I've answered it enough that even Reddit's search engine should find my posts."
• The amount that America paid Russia for Alaska: How was it determined?
• Why did Russia not make it to Alaska sooner, and why did they not expand more into North America?
• Why did Russia sell Alaska? Why did the U.S. buy it?
• Who else was interested in purchasing Alaska from Russia?
• What were the causes of Russia's failure to create a self sustaining operation in Alaska?
• What prevented Russia from colonizing Alaska?
• Why did Russia never heavily invest in colonizing Alaska, and other parts of western North America?
• Why did Russia sell Alaska?
• How did Russia come about controlling the large swath of land in Canada which became Alaska after it was sold to the US?
• Did the British Empire ever have interest in Alaska?: out of the FAQ, but there's no "Alaska" section that I've found
• Did the UK consider trying to conquer Russian Alaska during the 19th century (during the Crimean War, for example)?: also from the FAQ