To completely answer your question, it would be helpful to understand exactly what you're asking.  'Russians'  could refer to a number of entities. For example, you could mean small-scale actions by any humans living in Russia or you could mean large-scale operations at the level of the nation state colloquially known as "Russia". What's more, it has been nearly a century at the time of this response since the 1930s; a century that saw drastic transformation in the Russian nation-state, its geopolitical situation, its culture, and much more. Due to these dramatic changes, the reasons for 'invasion' necessarily will be just as varied. Finally, one must take into account the historical context of Russia and the Eurasian super-continent as a whole. This context shapes who, what, and where is seen as 'Russian', and depending on who you ask, you are likely to get answers as rich in variety as the history they encapsulate, just as you would asking inhabitants of any other well-established nation.
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