By Pavel Polityuk and Tom Balmforth KYIV (Reuters) -Blasts boomed across Kyiv on Wednesday morning after officials said Russia launched its first missile attack on the Ukrainian capital since August,

The attack ended a two-month pause in missile strikes on Kyiv, which had only been hit by Russian drones during that period.

The U.S. says there will be a "firm response" as Ukrainian forces holding ground in Russia's Kursk region now face North Korean troops "engaging in combat."