KYIV, Ukraine (AP) — Ukrainian air defenses have thwarted an intense Russian air attack on Kyiv, shooting down all 18 missiles aimed the capital. Loud explosions boomed over Kyiv as the attack early Tuesday combined Russian missiles launched from the air, sea and land in an apparent attempt to overwhelm Ukraine’s air defenses. No casualties were reported. It is the eighth time this month that Russian air raids have targeted the capital, a clear escalation after weeks of lull and ahead of a much-anticipated Ukrainian counter-offensive. It also came as President Volodymyr Zelenksyy concluded a whirlwind European tour to greet Ukraine’s key wartime allies, which spurred an additional tranche of pledged military aid.