If I was an opportunist, who wanted to destabilize the country further for some land grab, I'd do what Putin is doing.
I don't think there will be an election in May...delaying it because of the country's unrest would certainly give more time to bring in the rest of the crew....keeping in mind the Pres. has already said they are NOT going to go with Nato or further with the Eu, rather remain Independent....which was not the plan when they took over.
Time will tell but there's no reason to trust for a moment the likes of what sits in Kiev's Government at this point....who I believe have aspirations for Ukraine other than what the US or Russia might like.