There’s a story here, not well reported, about how both the United States and Russia have, apparently, been supporting political opposition movements in each other’s “spheres of influence.”.
So here is U.S. Ambassador Nuland’s discussion of her government’s interference in the Ukraine, in supporting it becoming more tied to Europe, as opposed to Russia, with the help of $5 billion dollars over the last 20 years.
In addition, here is a discussion of the whys and how-could-it-be’s of support for such a Ukrainian opposition,
Brzezinski Mapped Out the Battle for Ukraine in 1997
It's all about maintaining the US position as the world's sole superpower
Strangely, I think, here’s a discussion in the journal Foreign Affairs of the claim that Russia has been meddling in the politics of Europe by supporting, of all people, the far right,
Putin's Western Allies
Why Europe's Far Right Is on the Kremlin's Side
Given that one of Russian President Vladimir Putin’s stated reasons for invading Crimea was to prevent “Nazis” from coming to power in Ukraine, it is perhaps surprising that his regime is growing closer by the month to extreme right-wing parties across Europe. But, in both cases, Putin’s motives are not primarily ideological. In Ukraine, he simply wants to grab territory that he believes rightly belongs to him. In the European Union, he hopes that his backing of fringe parties will destabilize his foes and install in Brussels politicians who will be focused on dismantling the EU rather than enlarging it.