Russia-Ukraine updates: Putin suspends key US-Russia nuclear treaty in speech denouncing West

Russia is in a "desperate" position in its war in Ukraine and is running out of weapons and allies, according to the United Kingdom's top cyber spy.

"We believe that Russia is running short of munitions, it’s certainly running short of friends," Jeremy Fleming, director of the U.K. spy agency GCHQ, told BBC Radio in an interview Tuesday. "Russia and Russia's commanders are worried about the state of their military machine."

"The word I've used is 'desperate,'" he added. "We can see that desperation at many levels inside Russian society and inside the Russian military machine."

Russian President Vladimir Putin has ordered a series of missile strikes across Ukraine in the last 48 hours in retaliation for an attack on the strategically important Kerch bridge into Crimea over the weekend, with Fleming arguing that this will have depleted Moscow's dwindling arsenal.

"Russia, as we've seen in the dreadful attacks yesterday, still has a very capable military machine," he told BBC Radio. "It can launch weapons, it has deep, deep stocks and expertise. And yet, it is very broadly stretched in Ukraine."

-ABC News' Zoe Magee

At least 19 people have died since Russian missiles struck civilian and critical infrastructure targets across Ukraine on Monday, according to the Ukrainian State Emergency Service.

Another 105 people were injured in the attacks in over a dozen Ukrainian regions, including the capital Kyiv, where more than 30 fires broke out.

Ukrainian President Volodymyr Zelenskyy on Monday said Russia's missile assault on civilian targets across Ukraine showed Russia's "true face."

Eleven people have died and 64 are hurt across eight oblasts and the city of Kyiv, according to the Ukrainian State Emergency Service.

"The world once again saw the true face of a terrorist state that is killing our people," Zelenksyy said on Twitter. "On the battlefield & in peaceful cities. A country that covers its true bloody essence & goal with talks about peace. It proves that the liberation of is the only basis of peace & security."

Russian President Vladimir Putin said Monday’s attacks on civilian areas across Ukraine were a response to Saturday’s attack on the bridge connecting Russia and Crimea.

“To leave without an answer a crime of such a type is already simply impossible. This morning, at the proposal of Russia’s ministry of defense and general staff, a massive strike of high precision, long-range weapons has been delivered from air, land and sea, on Ukraine's energy facilities, military command and communication,” Putin said.

He added, “In the case of continuing terrorist attack on our territory, the answers from Russia will be severe and by their scale correspond to the level of threat created for the Russian Federation. No one should have any doubts about that.”

-ABC News’ Joe Simonetti and Tanya Stukalova