The Ambassador said this to journalists at the Kyiv Institute of Postgraduate Education after the oath ceremony of US Peace Corps volunteers in Ukraine on Tuesday, an Ukrinform correspondent reports.
"We are shocked by the escalation happening in eastern Ukraine in recent days. We have seen how Russian-led separatists shot down an OSCE’s unmanned aerial vehicle. And we have seen in the OSCE report that the separatists are moving along the contact line in columns in order to carry out raids and attacks," he said.
Ambassador Pyatt noted that US President Barack Obama had stated at the G7 summit that the violence must be stopped.
"It is in Russia’s power to stop this violence," the US Ambassador to Ukraine added.