Usage of "any" and "the" before other in comparative degree

Hi there, Do I need to use any or the before other in the following sentence when comparing things?

Here are the examples:

• Moscow is bigger than any other city in the world.
• Moscow is bigger than other cities in the world.
• Moscow is bigger than the other cities in the world.

Some more examples:

• John is taller than other boys.
• John is taller than any other boy.