KYIV, Ukraine (AP) — Russia took aim at Western military supplies for Ukraine’s government with early Sunday airstrikes in Kyiv that it said destroyed tanks donated from abroad, a claim denied by a Ukrainian official. Russian President Vladimir Putin warned that any Western deliveries of long-range rocket systems to Ukraine would prompt Moscow to hit “objects that we haven’t yet struck.”

The cryptic threat of a military escalation from the Russian leader didn’t specify what the new targets might be, but it comes days after the United States announced plans to deliver $700 million of security assistance for Ukraine. Those weapons include four precision-guided, medium-range rocket systems, helicopters, Javelin anti-tank weapon systems, radars, tactical vehicles and more.

Military analysts say Russia is hoping to overrun Ukraine’s embattled eastern industrial Donbas region, where Russia-backed separatists have fought the Ukrainian government since 2014, before any US weapons that might turn the tide arrive. The Pentagon said last week it will take at least three weeks to get the precision US weapons onto the battlefield.

Ukraine’s General Staff said Russian forces fired five X-22 cruise missiles from the Caspian Sea toward Kyiv, and one was destroyed by air defenses. Four others missiles hit “infrastructure facilities,” but Ukraine said there were no casualties. Nuclear plant operator Energoatom said one cruise missile buzzed close to the Pivdennoukrainsk nuclear plant, 350 kilometers (220 miles) to the south, and warned of the catastrophic dangers if such a near miss turned into a direct hit.

In a television interview that aired Sunday, Putin lashed out at Western deliveries of weapons to Ukraine, saying they aim to prolong the conflict.

“All this fuss around additional deliveries of weapons, in my opinion, has only one goal: To drag out the armed conflict as much as possible,” Putin said. He insisted such supplies were unlikely to change the military situation much for Ukraine’s government, which he said was merely making up for losses of similar rockets that they already had.

If Kyiv gets longer-range rockets, he added, Moscow will “draw appropriate conclusions and use our means of destruction, which we have plenty of, in order to strike at those objects that we haven’t yet struck.”

The US has stopped short of offering Ukraine longer-range weapons that could fire deep into Russia. The four medium-range High Mobility Artillery Rocket Systems included in the security package include launchers on wheels that allow troops to strike a target and then quickly move away — which could be useful against Russian artillery on the battlefield.

The Spanish daily El Pais reported Sunday that Spain was planning to supply anti-aircraft missiles and up to 40 Leopard 2 A4 battle tanks to Ukraine. Spain’s Ministry of Defense did not immediately respond to a request for comment.