In the 20 th Century which two countries attempted to invade Russia from the west? Why were they unsuccessful?

"The Great Game" was a political and diplomatic confrontation that existed for most of the 19th century between the United Kingdom and Russia over Afghanistan and neighbouring territories in Central and South Asia.

Explanation:

Britain was fearful of Russia invading India to add to the vast empire that Russia was building in Asia. As a result, there was a deep atmosphere of distrust and the talk of war between the two empires.[1][2][3] Britain made it a high priority to protect all the approaches to India, and the "great game" is primarily how the British did this. Historians with access to the archives have concluded that Russia had no plans involving India, as the Russians repeatedly stated.