As far as I can tell the whole mess started because Russia pressured Yanukovych to renege on signing the EU co-operation agreement to which he'd already committed and which had passed parliament, leading to the revolution of dignity and the Russian-directed separatist movement in response.
Ukraine wasn't imminently joining NATO but it seems pretty likely now (along with Sweden and Finland).
The context of that call (as far as I can decipher it) was about who they'd like to see Yanukovych pick as prime minister between Yatseniuk and Klitschko. Meddling maybe (although Ukraine was turning toward the west and the sides had to interface) but there isn't a word about couping Yanukovych as pro-Russian takes portray it, rather just a new cabinet under Yanukovych being negotiated trying to compromise with the opposition, who ended up refusing the deal. And ultimately the escalation of the popular protests to ousting Yanukovych was followed by democratic presidential elections recognized internationally including by Russia.
Regarding NATO expansion, I don't think there was ever any true international agreement limiting it, and it doesn't happen autonomously without nations seeking to join, and Russia had also committed to Ukraine's full sovereignty in agreements like the Budapest memorandum.