As Ukraine and Russia prepare for peace talks scheduled for June 2 in Istanbul, few observers expect a breakthrough. While the U.S. and Ukraine have pushed for an unconditional ceasefire, the Kremlin has rejected it.

Kyiv said it was committed to the search for peace, but that it was waiting for a memorandum from the Russian side setting out their proposals.

Ukraine's president has questioned Russia's commitment to progressing peace talks after Moscow confirmed it was sending a team to talks in Istanbul on Monday. Russia is yet to send its negotiating proposals to Ukraine - a key demand by Kyiv.