The ambassador told journalists at the Kyiv Institute of Postgraduate Education after the oath-taking ceremony of the U.S. Peace Corps volunteers in Ukraine on Tuesday, Censor.NET reports citing Ukrinform.
"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 U.S. President Barack Obama had stated at the G7 summit that the violence had to be stopped.
"It is in Russia's power to stop this violence," the U.S. Ambassador to Ukraine added.