European countries vowed Friday to sends billions of dollars in further funding to help Ukraine keep fighting Russia’s invasion, as a U.S. envoy pursued peace efforts in a trip to meet with Russian President Vladimir Putin amid growing questions about the Kremlin’s willingness to stop the more than three-year war.

Russian forces hold the advantage in Ukraine, with the war now in its fourth year. Ukraine has endorsed a U.S. ceasefire proposal, but Russia has effectively blocked it by imposing far-reaching conditions. European governments have accused Putin of dragging his feet.

“Russia has to get moving” on the road to ending the war, President Donald Trump posted on social media. In Russia, the Kremlin said Trump’s envoy Steve Witkoff met with Putin in St. Petersburg.

German Defense Minister Boris Pistorius said that his country would provide Ukraine with four IRIS-T short- to medium-range systems with missiles, as well as 30 missiles for use on Patriot batteries. The Netherlands plans to supply a Hawkeye air defense system, an airborne early warning aircraft.

— The Associated Press