Speaking in Estonia Tuesday, Cleverly said Ukraine "has a right" to project force "beyond its own borders" as part of its self-defense, following a series of drone strikes that hit Moscow's wealthiest neighborhoods.  The map below shows the Drone impact locations:

The U.K. minister argued that Kyiv striking inside Russia would "undermine" the Kremlin's ability to continue its war in Ukraine, which has officially denied responsibility for the attack.

Dmitry Medvedev, former Russian president and deputy chair of the Russian Security Council, hit back on Wednesday arguing that the U.K. is "de facto leading an undeclared war against Russia" by supplying Ukraine with military aid and specialists.

"That being the case, any of its public officials (either military, or civil, who facilitate the war) can be considered as a legitimate military target," he wrote on Twitter.

Medvedev, who regularly makes blunt remarks about the war in Ukraine and has called for the killing of Ukrainian President Volodymyr Zelenskyy, warned: "The goofy officials of the U.K., our eternal enemy, should remember that within the framework of the universally accepted international law which regulates modern warfare, including the Hague and Geneva Conventions with their additional protocols, their state can also be qualified as being at war."