Crimea was part of Russia until 1954, when the communist party decided to transfer it to Ukraine. But at that time both were part of the USSR, so the change was only theoretical. It has had a Russian ethnic majority since about 1900, which continued after the dissolution of the USSR.
The Russians resented being part of Ukraine, presently forming about 70% of the population, and naturally wanted to be part of their Motherland. In 1992 constitutional independence was declared, but the government in Kiev refused a referendum to confirm this. After the elected government of Ukraine was deposed, and revolutionaries took power in Kiev in 2014, Russian troops spread out from the large Russian naval base on the peninsula to protect their installation (which had been agreed between Ukraine & Russia after the dissolution of the USSR).
Later Crimean separatists elicitied support from Russian forces to press their case to rejoin Russia, which the Western opponents of Russia label an annexation (whilst conveniently overlooking their own more blatant intervention to annex Kosovo from Serbia). By any rational analysis it is merely a democratic choice by the people in Crimea.
To make sure they kept control of the naval base at Sevastopol. In my opinion, anyway.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.