Tsarfan, the situation in Russia was not the same as in Western Europe or the United States. As James pointed out, most assassination attempts on Western leaders and heads of state were perpetrated by lone individuals, many of whom were mentally ill. In Russia terrorism was a highly organized affair carried out by revolutionary groups like the People’s Will and later, under Alexander II’s grandson, Nicholas II, even by an actual political party, the Socialist Revolutionaries.
The number of attempts on Alexander II’s life alone was quite extraordinary. But other government officials also suffered.
1866- The revolutionary Dmitry Karakozov fired a pistol at Alexander II while he was walking in the Summer Garden
1873 – The People’s Will attempted to mine the railroad carrying Alexander II’s train not just once but twice
1878- Vera Zasulich attempted to assassinate General Trepov, the Chief of the Police
1879- Prince Kropotkin, Governor-General of Kharkhov, was assassinated by a revolutionary who also volunteered to kill the tsar (the People’s Will turned down his offer)
1880- The People’s Will blew up the Yellow Hall of the Winter Palace, where the tsar would be dining. The explosion killed eleven people and wounded fifty-six. (Queen Victoria never faced exploding bombs in Buckingham Palace!)
The People’s Will made seven (yes, seven) more attempts that year to assassinate the tsar. All of them miscarried.
Finally, as we all know, on March 1, 1881, the People’s Will succeeded in assassinating Alexander II.
1887- The self-proclaimed Terrorist Section of the People’s Will (including Lenin’s brother, Alexander Ulyanov) was discovered plotting to assassinate Alexander III. The bombs were already prepared.
Revolutionary terrorism was brought under control during the reign of Alexander III, but experienced a major revival under Nicholas II with the formation of the Socialist Revolutionary Party. The S.R.s murdered many government officials, including two ministers of the interior, Sipiagin (1902) and Plehve (1904). Grand Duke Sergei Alexandrovich was assassinated as well. According to the historian Nicholas Riasanovsky, terrorism on the Left claimed 1,400 deaths in 1906 and upwards of 3,000 in 1907. For example, the attempt to assassinate Stolypin in August 1906 resulted in the deaths of 32 people. And although the prime minister escaped, his son and daughter were both wounded, his daughter quite seriously.
The threat to the imperial family was real. After all, what happened to the Romanovs after the October Revolution? Members of that dynasty were murdered in Ekaterinburg, Alapaievsk, Perm, and Petrograd.