Russian Foreign Minister Sergey Lavrov said that Russia possesses weapons "that will have serious implications for the handlers of the Ukrainian regime."

A close ally of President Vladimir Putin warned Western governments on Thursday that a nuclear war would ensue if they gave the green light for Ukraine to use long-range Western weapons to strike targets deep inside Russia.

Vladimir Putin's military command was preparing for a potential incursion into Russia's Kursk region months in advance, according to seized army documents.

According to documents obtained by the Ukrainian military and shared with The Guardian, Russia's military command foresaw Ukraine's August 6 incursion and failed to act on warnings from those in the region. Newsweek has contacted the Russian Ministry of Defense for comment on the reports.

Ukraine's President Volodymyr Zelenskiy attends a joint press conference with European Commission President Ursula Von der Leyen (not pictured), amid the Russia-Ukraine conflict, in Kyiv, Ukraine September 20,

Ukraine's foreign minister said on Saturday that Russia is planning strikes on Ukrainian nuclear facilities before the winter, and urged the U.N.'s nuclear watchdog and Ukraine's allies to establish permanent monitoring missions at the country's nuclear plants.

Vyacheslav Volodin, chairman of the Russian Duma, has chillingly warned that Moscow can target the 'EU Capital' with nuclear weapons

In a shocking escalation, Russian forces launched a devastating missile attack targeting Ukraine’s secret intelligence communications centre. Massive explosions rocked Kyiv and surrounding regions, including Kharkiv and Sumy,

The explosion would be at an old Soviet test site first used 70 years ago in the Novaya Zemlya archipelago and could be used by Vladimir Putin as a warning to the West over Ukraine