At least seven people were killed and 26 injured as Russia and Ukraine launched targeted each other overnight in an escalating round of tit-for-tat strikes, authorities in both countries said.

The attacks on Moscow come days before a Putin-announced three-day ceasefire, and a major parade in the Russian capital.

Ukraine launched a large drone attack overnight on Russia that led to the country closing several airports in and around Moscow. More than 100 drones hit targets across 11 regions in Russia on Tuesday,