KYIV, Ukraine (AP) — Ukraine on Monday marked the bleakest anniversary yet of its war against the Russia invasion, with the country’s forces under severe pressure on the battlefield and U.S. President Donald Trump’s administration apparently embracing the Kremlin in a reversal of U.S. policy.

The three-year milestone drew more than a dozen Western leaders to Kyiv for commemorative events in a conspicuous show of support. They warned of the war’s wider implications for global security and vowed to keep providing billions of dollars in support for Ukraine as uncertainty deepens over the U.S. commitment to help. Washington did not send any senior official to the occasion.

Hours after the anniversary observances, Trump said Russian President Vladimir Putin would accept European peacekeepers in Ukraine as part of a potential deal to end the war. Separately, Putin suggested that European countries could be part of a settlement, but he also said that he has not discussed resolving the conflict in Ukraine in detail with Trump.

The fourth year of fighting could be pivotal as Trump uses his return to office to press for a peace deal.

“The autocrats around the world are watching very carefully whether there’s any impunity if you violate international borders or invade your neighbor, or if there is true deterrence,” European Commission President Ursula von der Leyen warned.

Canadian Prime Minister Justin Trudeau echoed that sentiment. Canadians, he said, “believe deeply that it’s not just about Ukraine. It’s about the rules and the values and the principles of sovereignty, of independence, territorial integrity that protects every country in the world. All of us rely on those rules to be able to build peace and security.”

Some observers say Russian success in Ukraine could embolden China’s ambitions. Just as Moscow claims that Ukraine is rightfully Russian territory, China claims the self-governing island of Taiwan as its own. North Korea and Iran have also aided Russia’s war effort.

In a cascade of unwelcome developments for Kyiv, Trump has in recent days called Ukrainian President Volodymyr Zelenskyy a dictator, suggested Ukraine is to blame for the war and ended Russian President Vladimir Putin’s three-year diplomatic isolation by the United States. U.S. officials have also indicated to Ukraine that its hopes of joining NATO are unlikely to be realized and that it probably won’t get back the land that Russia’s army occupies, which amounts to nearly 20% of the country.