The new Ukrainian President will not be as submissive towards the United States as President Poroshenko, so the US-Ukraine relations may deteriorate. This situation will cause the automatic worsening of the Polish-Ukrainian relations once Polish authorities realise the American policy towards Ukraine. Thus, relations between Poland and Ukraine will deteriorate not because of historical issues, but because of the complete dependency of Polish foreign policy on the United States.
The third Eastern Partnership summit that took place in Vilnius in November 2013 was a formal impulse for the сoup d’état in Ukraine. Thus, the Eastern Partnership played a destructive role in European politics as it accelerated the process of disintegration of the post-Soviet region.
Recurring pro-Kremlin narrative that the Euromaidan protests were inspired and staged by the West because President Yanukovych had refused to sign the Association Agreement with the EU. This narrative assumes that the West initiated the geopolitical fight over control of Ukraine as the legitimate authorities of this country had refused to accept their political subordination to the West. See examples of this narrative here, here and here.
There was no coup d’état in Kyiv in 2014, this is a recurring pro-Kremlin narrative about the Euromaidan. The spontaneous onset of the Euromaidan protests was a reaction of numerous parts of the Ukrainian population to former President Yanukovych’s sudden departure from the promised Association Agreement with the European Union in November 2013. See the full debunk here.