Even as Russia has stepped up its meddling in Western politics, recent political events have made Ukraine, long part of the Russian orbit, embrace the West-- and that orientation is reflected in the language that its politicians speak.
In short, they've gradually been eschewing Russian (which most Ukrainians speak natively) in favor of the national language, Ukrainian, when making speeches in Parliament.
But even as Russian in parliament becomes rarer, year-to-year shifts in political orientation haven't meant much. In 2004, the "Orange Revolution" resulted in a hard turn westward-- but in subsequent years, Russian use in Parliament actually went up slightly. Conversely, the election in 2010 of the same pro-Russian president who was thwarted six years earlier had no effect on Russian's downward slide.
