According to the Russian foreign ministry on Saturday, Russia has implemented sanctions against UK Prime Minister Boris Johnson, Foreign Minister Elizabeth Truss, Defense Minister Ben Wallace and other top-level officials as they have been banned from entering Russia.

Read more: UK PM: Sanctions on Russia should continue until withdrawal from Ukraine

According to the statement, "It was decided to include key members of the British government and a number of political figures to the Russian 'stop list' amid the unprecedented hostile actions of the British government, expressed in particular in the imposition of sanctions against senior officials of the Russian Federation."

The ministry stated that the additional measures are in reaction to London's information and political campaign aimed at isolating, confining, and choking Russia's economy.

Read more: EU and UK sanctions to exacerbate energy crisis

The ministry also accused the UK of purposely inflaming the situation in Ukraine, shipping lethal armaments to Kiev, and pressuring other nations to impose sanctions on Russia, as well as of "the Russophobic course of the British authorities."

The list now comprises 13 UK officials, with plans to extend it "in the near future" to include lawmakers and members of parliament.

British SAS troops have trained Ukrainian forces for the first time since the Russian offensive began, Ukrainian commanders told The Times on Friday.

Instructors from the UK were previously withdrawn from the country in February when NATO member states were expecting a Russian attack.

The British now returned to teach locals how to use NLAWs, UK-supplied shoulder-fired anti-tank missile launchers, the paper wrote, citing Captain Yury Myronenko and two other Ukrainian commanders, identified only by their nicknames.

The units which received the training are stationed around Kiev, The Times noted.

Read more: UK to supply Ukraine with 120 armored vehicles, $500mln in World Bank loans