By Kevin Liptak, CNN

(CNN) — Russian President Vladimir Putin told US President Donald Trump in a phone call Wednesday that Moscow was obligated to respond to Ukraine’s weekend drone attack, Trump said, setting up a potential escalation in the conflict just as the US president hopes to broker an end to the war.

The leaders’ conversation was their second time speaking in a matter of weeks. Trump, who announced the call afterward in a post on Truth Social, made no mention of applying pressure on the Russian leader to agree to a ceasefire, or to calibrate his reprisal for Ukraine’s audacious drone attack on Russian airfields over the weekend.

Instead, Trump acknowledged the 75-minute conversation would not yield an immediate end to the war in Ukraine.

“We discussed the attack on Russia’s

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