Vladimir Putin
Vladimir Putin, Russia's president, leads his government with the world's most robust security strategy. He is widely regarded as the world's most powerful person, and he commands the world's most advanced nuclear arsenal. As one of the world's most powerful politicians, Vladimir Putin is constantly guarded by an elite security agency and the country's military. This is why Putin has escaped assassination by his adversaries for so long.
The Russian government, like China, is adamant about not disclosing information on this special force that protects the Russian president and his family; in reality, no data on their operations is available, and only a few reports are made public.
Most things can only be assumed because they are so closely guarded, but keeping Putin alive for so long as the president demonstrates that they are doing something extremely well. Vladimir Putin is widely regarded as the most secure person on the planet.