Ukraine war live updates: Conflict reaches day 800, Russia says it curbed Ukrainian attacks overnight

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

The Russia-Ukraine war reached day 800 on Friday, crossing another milestone in the ongoing conflict as the battle continues with no resolution appearing imminent.

A spokesperson for the Russian foreign ministry late on Thursday reiterated that Russia would not take part in the peace summit that is set to be held in June in Switzerland. The Swiss government said Thursday that Russia has not been invited.

"We once again confirm and emphasize that Russia will not participate in the Swiss 'summits' either at the first or at subsequent stages, regardless of whether it receives an invitation or not," Maria Zakharova said, according to a Google-translated statement posted on the Russian foreign ministry's website.

Meanwhile, Russia's defence ministry on Friday said it had thwarted attacks from Ukraine overnight, with its air defence systems destroying six drones, according to a post by the ministry on Telegram.

Five drones were intercepted over the Belgorod region at the border of Russia and Ukraine, while one was destroyed over Russian-occupied Crimea on the Black Sea, according to a Google-translation of the post.

CNBC could not independently verify the information.

German Foreign Minister Annalena Baerbock on Friday that Russia would face consequences for a cyberattack which was allegedly carried out by a group linked to Russian military intelligence services.

Several German websites were taken offline by Russian hackers in early 2023 following Germany's decision to provide tanks to Ukraine, the country said.

"We can now clearly attribute last year's attack to the Russian group APT28, which is controlled by the Russian