There is also a growing awareness that the EU must provide for its own security, with election campaigning in the U.S. raising questions about Washington’s commitment to its allies.

Ukraine has launched a massive new wave of drone attacks as Russians cast ballots on the final day of a presidential vote set to extend President Vladimir Putin’s rule for another six years

Foreign leaders have made numerous trips to Ukraine, and they occasionally have had to take refuge in shelters when air raid sirens sound.

The smart use of remote-controlled drone boats laden with explosives has allowed Ukraine to tip the scales of naval warfare in its favor despite Russia’s massive superiority in firepower.