Nothing, as there is no longer a monarchy. It was Czar, a corruption of "Caesar".
If the person is the president of a corporation which is called an industrial empire, he would probably not like to be called an emperor. If the person is a dictator who made himself emperor as well as president, I suppose you could call him an emperor. Emperor is usually a title applied to king-like figures. President usually indicates an elected leader. The two titles are contradictory.
st.petersburg.
Czar also known by Caesar
An Empress
Imperator (emperor). Or he could be unofficially called Tsar.
Russia was a monarchy and its heads of states were called Tsars (or Tzars) which means Emperor.
A tsar was a Russian emperor.
It is Czar
Tsar or Czar
Czar Alexander
Another word for a Russian empress is Czarina. An empress is the wife or widow of an emperor or holds the rank of emperor in her own right and has great power and influence.
Tsar Nicholas
Japan is the only empire today and it's ruled by emperor Akihito. His empress consort is called Michiko. Grand Duchess Maria Vladimirovna is claimant to the Russian throne, but she is (still) not the Empress.
Russian onions are called "Π»ΡΠΊ" (luk) in Russian.
Byzantium and Russia were different empires with many rulers in their long existence as empires.In Byzantium the emperor was called Autocrat and in the late Russian empire it was called Czar or Tsar.
A Tsar (Царь in Russian)(Tzar, Csar or Czar) was the emperor of Russia until the 1917 February Revolution. Tsar is a Russification of the Roman word Caesar.The first Russian emperor to use the title was Tsar Ivan III (the Great). By the time the Romanovs came to power, it had become the standard title applied to the Russian head of state.male monarch or emperor