руския

In a sentence

• Много харесвам руския език.

  I really like the Russian language.

  Here, 'руския' modifies 'език', indicating 'the Russian language' as an object.

• Четох интересна статия в руския вестник.

  I read an interesting article in the Russian newspaper.

  Here, 'руския' describes 'вестник', referring to 'the Russian newspaper' in which an action occurred.

• Говоря доста добре руския.

  I speak Russian quite well.

  Here, 'руския' stands for 'the Russian language', expressing the object of the speaking ability.