The US does not want regulation of the situation in the east of Ukraine. US and Ukraine oppose Putin’s proposal to deploy UN peacekeepers in the east of Ukraine because Washington and Kyiv want to prevent enforcing the Minsk agreements.
No evidence given.
Since 2015, Ukraine has been repeatedly appealing to the UN to deploy peacekeepers to Ukraine and locate them not just along the contact line between the army of Ukraine and the separatists, as Russia proposes now, but throughout all the territory of Donbas, and along the border with Russia. http://www.atlanticcouncil.org/blogs/ukrainealert/ukraine-s-diplomatic-war-for-peace
Moreover, on September 20, at the session of the UN General Assembly, President Petro Poroshenko again called for the deployment of peacekeepers there. http://www.reuters.com/article/us-un-assembly-ukraine/ukraines-poroshenko-rejects-russias-hybrid-peackeeping-offer-idUSKCN1BW04Q?il=0
As for the Minsk agreements, both Kyiv and Washington - also repeatedly – have stated that only these agreements can stop the war and ensure peace in this region.
Most of the Minsk agreements measures depend above all on Russia and its proxies, including the need for a ceasefire, the withdrawal of all heavy weaponry, full monitoring access for the OSCE, and the full restoration of control of the state border to the Ukrainian government.