The Russian defence ministry said it had targeted Ukraine's defence sector and energy sites in response to "attacks on civilian targets in Russia".It said Russia had downed more than 300 Ukrainian drones between late Monday and early Tuesday, with several airports across the country temporarily halting flights throughout the morning.Short-term ceasefires are not infrequent, with the two sides having suspended long-range attacks over Orthodox Easter last month.There is no sign that the four-year war is close to being resolved at the negotiating table.Moscow is demanding that Kyiv fully withdraws its troops from the eastern Donbas area and renounces Western military...