Is The New Ukraine Government Legitimate?

It has been a very busy few days for Ukraine's parliament. They just reinstated the 2004 constitution, which basicly turns Ukraine back to a parliamentary system rather than a presidential one. The parliament also appointed a new interior minister and speaker of the parliament (both which are part of the Fatherland Party, led by the recently freed Yulia Tymoshenko), and now the parliament is moving to impeach measures against former President, Viktor Yanukovych. Or should I say current president? Because even before the impeachment proces started, the parliament dismissed Yanukovych, on grounds that he was incapable of fulfilling his presidential duties. This is very dubious because technically speaking such a charge does not excist in Ukraine's constitution. Im not defending the legitimacy Yanukovych, but the parliament simply bypassed the entire impeachment proces and thus acted against their own constitution, therefore one can argue whether this was a coup or not.