Rus­sia overnight launched the biggest drone at­tack on Ukraine in the more than three-year war, a Ukrain­ian of­fi­cial said Mon­day. Pres­i­dent Don­ald Trump said Russ­ian leader Vladimir Putin has gone “crazy” by step­ping up the bomb­ing of Ukraine just as the U.S. tries to bro­ker peace.

The Russ­ian bom­bard­ment on Sun­day night in­clud­ed 355 drones, Yuriy Ih­nat, head of the Ukrain­ian air force’s com­mu­ni­ca­tions de­part­ment, told The As­so­ci­at­ed Press.

The pre­vi­ous night, Rus­sia fired 298 drones and 69 mis­siles of var­i­ous types at Ukraine in what Ukraini­ans said was the largest com­bined aer­i­al as­sault dur­ing the con­flict. From Fri­day to Sun­day, Rus­sia launched around 900 drones at Ukraine, of­fi­cials said.

The es­ca­la­tion ap­peared to thwart hopes that Trump’s peace ef­forts might lead to a break­through in the near term, as Putin looks de­ter­mined to cap­ture more Ukrain­ian ter­ri­to­ry and in­flict more dam­age.

Rus­sia has this month bro­ken its record for aer­i­al bom­bard­ments of Ukraine three times. The ex­pan­sion of its air cam­paign came af­ter Kyiv in March ac­cept­ed an un­con­di­tion­al 30-day cease­fire pro­posed by the U.S. but Moscow ef­fec­tive­ly re­ject­ed it.

Rus­sia is al­so still push­ing along the rough­ly 1,000-kilo­me­ter (620-mile) front line, where it has made slow and cost­ly progress, and is as­sem­bling its forces for a sum­mer of­fen­sive, Ukraine and mil­i­tary an­a­lysts say.

“On­ly a sense of com­plete im­puni­ty can al­low Rus­sia to car­ry out such at­tacks and con­tin­u­al­ly es­ca­late their scale,” Ukraine Pres­i­dent Volodymyr Ze­len­skyy wrote on Telegram on Mon­day. “There is no sig­nif­i­cant mil­i­tary log­ic to this, but there is con­sid­er­able po­lit­i­cal mean­ing.”

He re­peat­ed his call for tighter in­ter­na­tion­al eco­nom­ic sanc­tions on Rus­sia as a way of end­ing the war, be­cause Rus­sia’s “de­sire to fight must be de­prived of re­sources.”

The Eu­ro­pean Union’s top diplo­mat, for­eign pol­i­cy chief Ka­ja Kallas, on Mon­day de­scribed the lat­est at­tacks on Kyiv as “to­tal­ly ap­palling” and said the bloc in­tend­ed to im­pose more sanc­tions on Rus­sia.

Trump has threat­ened mas­sive sanc­tions on Moscow, too, but so far hasn’t tak­en ac­tion.

Krem­lin spokesman Dmit­ry Peskov said Putin makes de­ci­sions that are nec­es­sary to en­sure Rus­sia’s se­cu­ri­ty and that the at­tacks were Moscow’s re­sponse to deep strikes by Ukraine.

Rus­sia is grate­ful for Amer­i­can ef­forts to bring peace, which have in­clud­ed the coun­tries’ first di­rect peace talks in three years, Peskov said.

He said ne­go­ti­a­tions are at “a de­ci­sive mo­ment that is linked to emo­tion­al over­load­ing for every­one and emo­tion­al re­ac­tions.”

The Ukrain­ian num­bers for how many drones and mis­siles were fired could not be in­de­pen­dent­ly ver­i­fied.

Trump made it clear he is los­ing pa­tience with Putin. “I’ve al­ways had a very good re­la­tion­ship with Vladimir Putin of Rus­sia, but some­thing has hap­pened to him. He has gone ab­solute­ly CRAZY!” Trump wrote in a so­cial me­dia post on Sun­day night.

Trump said Putin is “need­less­ly killing a lot of peo­ple,” point­ing out that “mis­siles and drones are be­ing shot in­to Cities in Ukraine, for no rea­son what­so­ev­er.”

The U.S. pres­i­dent warned that if Putin wants to con­quer all of Ukraine, it will “lead to the down­fall of Rus­sia!” But Trump ex­pressed frus­tra­tion with Ukrain­ian Pres­i­dent Volodymyr Ze­len­skyy as well, say­ing that he is “do­ing his Coun­try no favours by talk­ing the way he does.”

Rus­sia and Ukraine swapped hun­dreds more pris­on­ers Sun­day in the third and last part of a ma­jor ex­change that was a rare mo­ment of co­op­er­a­tion

Rus­sia’s De­fense Min­istry said each side ex­changed 303 sol­diers, fol­low­ing the re­lease of 307 com­bat­ants and civil­ians each on Sat­ur­day, and 390 on Fri­day — the biggest to­tal swap of the war.

In their talks held in Is­tan­bul ear­li­er this month, Kyiv and Moscow agreed to swap 1,000 pris­on­ers of war and civil­ian de­tainees each. The ex­change has been the on­ly tan­gi­ble out­come from the talks. —KYIV, Ukraine (AP)

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Sto­ry by IL­LIA NOVIKOV and VOLODYMYR YURCHUK | As­so­ci­at­ed Press

Lorne Cook in Brus­sels con­tributed to this re­port.