ABOARD AIR FORCE ONE (AP) — President Donald Trump on Sunday warned Russia that he may send Ukraine long-range Tomahawk missiles if Moscow doesn’t settle its war there soon — suggesting that he could be ready to increase the pressure on Vladimir Putin’s government using a key weapons system.

“I might say, ’Look: if this war is not going to get settled, I’m going to send them Tomahawks,” Trump told reporters aboard Air Force One as he flew to Israel. “The Tomahawk is an incredible weapon, very offensive weapon. And honestly, Russia does not need that.”

His comments came after Trump spoke by phone earlier Sunday with Ukrainian President Volodymyr Zelenskyy, and Trump said he mentioned possibly sending Tomahawks during that conversation.

“Do they want to have Tomahawks going in that direction? I don’t think so,” Trump said of Russia. “I think I might speak to Russia about that.” He added that “Tomahawks are a new step of aggression.”

His suggestions followed Russia having attacked Ukraine’s power grid overnight, part of an ongoing campaign to cripple Ukrainian energy infrastructure before winter. Moscow also expressed “extreme concern” over the U.S. potentially providing Tomahawk cruise missiles to Ukraine.

Putin himself has previously suggested that the United States supplying long-range missiles to Ukraine will seriously damage relations between Moscow and Washington. For his part, Zelenskyy described his latest call with Trump as “very productive,” focusing on strengthening Ukraine’s “air defense, resilience, and long-range capabilities.”

Last month, Trump announced a significant shift in his stance, stating he believes Ukraine could win back all the territory lost to Russia — contrary to his previous calls for Kyiv to make concessions to end Russia’s war in Ukraine.

Trump remarked aboard Air Force One that “I really think Putin would look great if he got this settled” and emphasized the need for a resolution, asserting “It’s not going to be good for him if not.”