Russia's former president Dmitry Medvedev said Wednesday that British officials had become "legitimate military targets" due to the UK's support for Ukraine. 

"The UK acts as Ukraine's ally providing it with military aid in the form of equipment and specialists, i.e., de facto is leading an undeclared war against Russia," he stated in a tweet. 

Medvedev, who also is the deputy head of Russia's security council, also called the UK Moscow's "eternal enemy" for its support to Kyiv. 

His statement came after Russian President Vladimir Putin called Tuesday's drone attack on Moscow a "terrorist" act by Ukraine. 

Cleverly: Ukraine Has Right to "Project Force" Beyond Its Borders

The remark was made after British foreign secretary James Cleverly asserted Ukraine had the right to hit "legitimate military targets" beyond its borders in reference to the Moscow drone attack. 

In a press conference in Estonia Tuesday, he said Ukraine is obliged to defend itself and "project force" beyond its borders as part of its self-defense in stopping Russian aggression. 

"Ukraine does have the legitimate right to defend itself," he said. 

Regarding the NATO summit to be held in Lithuania in July, Cleverly said he and Estonian foreign minister Margus Tsahkna have "agreed" to "bolster support" for Ukraine. He added that both he and Tsahkna long for Sweden to join NATO as a fully-fledged member in the future. 

"Swedish accession will make us all safer and stronger," he said. 

Meanwhile, Downing Street stated no British-supplied equipment was used in the recent drone attacks. 

"Obviously, what we have seen are significant attacks on Kyiv in recent days, including on civilians," said an official representative to British prime minister Rishi Sunak.