Ukraine war live updates: Anti-Kremlin Russian armed groups claim to have launched incursion into Russian territory

This is CNBC's live blog tracking developments on the war in Ukraine. See below for the latest updates. 

Anti-Kremlin armed groups purportedly made up of Russians opposed to the Ukraine war have launched an incursion across Russia's western border on Tuesday, their social media pages claimed.

The Freedom of Russia Legion and the Siberian Battalion announced on their Telegram pages that they had launched attacks into Russia from Ukraine. They said they intended to "take our land away from the [Putin] regime, centimeter by centimeter" and called on Russians to boycott the forthcoming presidential election.

A third Russian rebel group, the Russian Volunteer Corps, appeared to confirm its participation on its Telegram account.

Andriy Yusov, a spokesperson for Ukraine's military intelligence, told Ukraine's 24 Channel the groups were conducting the operation on Russian territory independently of Ukraine, Reuters reported. CNBC could not independently verify the claims.

It's not the first time the groups have been active with two of the pro-Ukrainian Russian rebel groups launching raids into Russia's Belgorod region last May and June.

Roman Starovoit, the governor of Russia's Kursk region, which is on the border with Ukraine, said Tuesday that a "sabotage and reconnaissance group" had tried to break into the Kursk region but failed.

Earlier, Russia's defense ministry said seven regions were targeted by a wave of Ukrainian drones overnight, with attacks carried out against the Belgorod, Bryansk, Kursk, Leningrad, Moscow, Oryol and Tula regions.

A Russian official confirmed Tuesday that pro-Ukrainian, Russian armed groups had attempted to launch an incursion into the Kursk region that borders Ukraine.

Kursk Governor Roman