The US Secretary of State John Kerry has told Russia to demonstrate in the coming days that its promise not to intervene in Ukraine is sincere.

“This morning I called Foreign Minister Lavrov and we talked at some length about the transition and the events in Ukraine and the region and I asked, specifically, that Russia work with the United States and with our friends and allies in order to support Ukraine to rebuild unity, security and a healthy economy,” Kerry said at a joint news conference with German Foreign Minister Frank-Walter Steinmeier.

The White House earlier warned Russia to avoid “provocative” acts, and to support Ukraine’s territorial integrity and sovereignty.