WASHINGTON >> President Donald Trump on Monday threatened Russia with steep tariffs and announced a rejuvenated pipeline for American weapons to reach Ukraine, hardening his stance toward Moscow after months of frustration about unsuccessful negotiations for ending the war in Ukraine.

The latest steps reflect an evolving approach from the Republican president, who when campaigning last year promised to swiftly resolve the war started by Russian President Vladimir Putin when he invaded Ukraine three years ago.

Trump once focused his criticism on Ukrainian President Volodymyr Zelenskyy, whom he described as unwilling to compromise, but more recently has expressed growing irritation toward Putin.“My conversations with him are very pleasant, and then the missiles go off at night,” Trump said. He complained that “it just keeps going on and on and on.”

50-day deadline

Trump said he would implement “severe tariffs” unless a peace deal is reached within 50 days. He provided few details on how they would be implemented, but he described them as secondary tariffs, meaning they would target Russia’s trading partners in an effort to isolate Moscow in the global economy.

In addition, Trump said European allies would buy “billions and billions” of dollars of U.S. military equipment to be transferred to Ukraine, replenishing the besieged country’s supplies of weapons.

He made the announcement in the Oval Office alongside NATO Secretary-General Mark Rutte.

Included in the plan are Patriot air defense systems, a top priority for Ukraine as it fends off Russian drones and missiles.

Doubts were recently raised about Trump’s commitment to supply Ukraine when the Pentagon paused shipments over concerns that U.S. stockpiles were running low.

View from NATO

Rutte said Germany, Finland, Canada, Norway, Sweden, the United Kingdom and Denmark would be among the buyers to supply Ukraine. He said “speed is of the essence here,” and he suggested that some weapons would be rushed to Ukraine and later replaced with purchases from the U.S.

Later Monday, Zelenskyy posted about having spoken with Trump by phone and said he “discussed the necessary means and solutions with the President to provide better protection for people from Russian attacks and to strengthen our positions.”

Zelenskyy added that Trump had “agreed to catch up more often by phone and coordinate our steps in the future.”

Diplomatic front

While Rutte was in Washington, Trump’s special envoy to Ukraine and Russia, retired Lt. Gen. Keith Kellogg, met with Zelenskyy in Kyiv.

Zelenskyy said he had “a productive conversation” with Kellogg about strengthening Ukrainian air defenses, joint arms production and purchasing U.S. weapons in conjunction with European countries, as well as the possibility of tighter international sanctions on Russia.

“We hope for the leadership of the United States, because it is clear that Moscow will not stop unless its ... ambitions are stopped by force,” Zelenskyy said on Telegram.

Russia has pounded Ukrainian cities, including the capital, Kyiv, with hundreds of drones and cruise and ballistic missiles that Ukraine’s air defenses are struggling to counter. June brought the highest monthly civilian casualties of the past three years, with 232 people killed and 1,343 wounded, the U.N. human rights mission in Ukraine said.

At the same time, Russia’s bigger army is making a new effort to drive back Ukrainian defenders on parts of the 620-mile front line.

Trump confirmed the U.S. is sending Ukraine more badly needed Patriot air defense missiles and that the European Union will pay the U.S. for the “various pieces of very sophisticated” weaponry.

A senior Russian lawmaker, Konstantin Kosachev, said Trump’s plan had “only one beneficiary — the US military-industrial complex.”

‘Weapons flowing at a record level’

A top ally of Trump, Republican Sen. Lindsey Graham of South Carolina, said Sunday that the conflict is nearing an inflection point as Trump shows growing interest in helping Ukraine fight back against Russia’s full-scale invasion.

Although Trump had previously dismissed the effort as a waste of U.S. taxpayer money, Graham told CBS’ “Face the Nation” that “you’ll see weapons flowing at a record level.”

“One of the biggest miscalculations Putin has made is to play Trump,” he said. “And you just watch, in the coming days and weeks, there’s going to be a massive effort to get Putin to the table.”

Kirill Dmitriev, Putin’s envoy for international investment who took part in talks with U.S. officials in Saudi Arabia in February, dismissed what he said were efforts to drive a wedge between Moscow and Washington.

“Constructive dialogue between Russia and the United States is more effective than doomed-to-fail attempts at pressure,” Dmitriev said in a post on Telegram. “This dialogue will continue, despite titanic efforts to disrupt it by all possible means.”

Tariff legislation

Although Trump proposed targeting Russia with new tariffs, he expressed doubts about bipartisan legislation to punish the country even further.

“I’m not sure we need it,” he said. “It could be very useful. We’ll have to see.”

The legislation increases sanctions and places 500% tariffs on products imported from countries that buy Russian oil, gas and other exports. Trump on Monday proposed unilaterally implementing 100% tariffs.

“I use trade for a lot of things,” he said. “But it’s great for settling wars.”

In a joint statement, the co-sponsors of the sanctions package working its way through Congress, Graham and Democratic Connecticut Sen. Richard Blumenthal, praised Trump for having “made a powerful move.” They also defended their legislation, noting, “The benefit of our approach is that it blends congressional authorization of tariffs and sanctions with flexibility for presidential implementation, making it rock solid legally and politically.”