Since returning to the United States presidency, Donald Trump has taken a considerably softer approach to Russia amid its invasion of Ukraine.
This leeway offered to President Vladimir Putin may now be coming to an end after Russia launched a massive aerial bombardment of Ukraine.
On Truth Social, Mr Trump posted that President Putin must have, in his words, "gone absolutely CRAZY" for him to have unleashed the biggest drone attack of the war so far.
"I'm not happy with what Putin's doing. He's killing a lot of people. And I don't know what the hell happened to Putin. I've known him a long time. Always gotten along with him. But he's sending rockets into cities and killing people, and I don't like it at all. Okay? We're in the middle of talking, and he's shooting rockets into Kyiv and other cities. I don't like it at all."
He also says he's weighing up whether to apply new sanctions on Russia.
It comes as sleeping Ukrainians woke to a third consecutive night of huge Russian aerial attacks, listening for hours to drones buzzing near their homes and eruptions of Ukrainian anti-aircraft fire.
The night before, Russia pummelled Ukrainian cities with at least 367 drones and missiles, killing at least 12 people, including three children.
The Ukrainian Air Force said the most recent overnight attack hit targets in five locations, but did not elaborate.
Near Kyiv, in the village of Markhalivka, emergency service workers battle flames and crouch behind cover as more blasts ring out nearby.
One 28-year-old resident Tetiana Maksymenko says she and her child narrowly escaped disaster.
"We woke up from the sound of an explosion. I immediately grabbed my child, it's 20 months old, I covered it in a blanket and protected it. Then there was another explosion and a huge flash. I heard how everything was turned upside down, and then there was this noise stuck in my head and ears. There was dust everywhere, and when the dust settled, I heard my mother shouting from a lower floor. Carrying my child, I walked barefoot over shattered glass downstairs and we managed to leave through the back door."
Ukraine's President Volodymyr Zelenskyy says the Russian attacks - more than 900 drones as well as missiles over three nights - prove the world must apply more pressure to Russia to limit their military capability.
Swarms of drones are being launched by both sides while fierce fighting is under way along key parts of the front.
The Kremlin's spokesman Dmitry Peskov says the attacks were directed at military targets and that the strikes were a response to significant Ukrainian attacks on Russian civilian targets.
"We have seen the Ukrainians striking our social infrastructure facilities, peaceful infrastructure. This is a retaliatory strike, and a strike precisely at military facilities, at military targets."
Mr Peskov also responded to President Trump calling Vladimir Putin crazy, calling it part of an emotional overload.
"This is a very crucial moment, which is associated, of course, with the emotional overload of everyone absolutely and with emotional reactions. We follow this very closely."
President Trump's Truth Social post also criticised Mr Zelenskyy, stating that the Ukrainian leader: "is doing his country no favours by talking the way he does. Everything out of his mouth causes problems, I don't like it, and it better stop."
Mr Zelenskyy released a new video which did not address this criticism from Mr Trump but reiterated that he believes Russia's actions signal they have no interest in ending the war.
"We can see from the information obtained by intelligence and from open-source data that Putin and his entourage do not plan to end the war. There is currently no indication that they are seriously considering peace or diplomacy. On the contrary, there is ample evidence that they are preparing new offensive operations. Russia is counting on a prolonged war."
With President Trump's promise to end the three-year-long escalation of fighting between Russia and Ukraine so far unfulfilled, it remains to be seen how the US leader plans to pressure the warring parties into a negotiated peace deal.
