If the Ukrainian President Petro Poroshenko wins the upcoming elections, he will have to start an armed conflict with Russia to help the US in weakening it.
No evidence given. Recurring pro-Kremlin disinformation about the Ukraine elections 2019 and West's meddling.
In fact, it was Russia that provoked a war in Ukraine. The Office of the Prosecutor of the International Criminal Court has stated that “the information available suggests that the situation within the territory of Crimea and Sevastopol amounts to an international armed conflict between Ukraine and the Russian Federation. This international armed conflict began at the latest on 26 February 2014 when the Russian Federation deployed members of its armed forces to gain control over parts of the Ukrainian territory without the consent of the Ukrainian Government.
The European Union stated in July 2014 that "arms and fighters continue flowing into Ukraine from the Russian Federation".