Secretary of State Marco Rubio spoke with his European counterparts Monday and discussed diplomatic efforts to bring an end to the war in Ukraine, the State Department said.

Rubio spoke to U.K. Foreign Secretary David Lammy, Ukrainian Foreign Minister Andrii Sybiha, Finnish Foreign Minister Elina Valtonen and EU foreign policy chief Kaja Kallas among others, a spokesperson for the State Department said in a statement.

The call focused on security guarantees for Ukraine and the U.S role in them, Finnish President Alexander Stubb said.

Ukrainian Foreign Minister Andrii Sybiha said Ukraine was grateful to Rubio for his efforts and to U.S. President Donald Trump for his "peacemaking leadership." He added security guarantees for Ukraine were key.

"I reiterated Ukraine's position that security guarantees must be concrete, legally binding, and effective. They should be multidimensional, including military, diplomatic, legal, and other levels," Sybiha said on X.

"We all share the conviction that the Ukrainian army is the fundamental level of any such guarantees, therefore its maximum strengthening is our top priority."

Trump, after his separate summits with Russian President Vladimir Putin and later with Ukraine's President Volodymyr Zelenskyy and European leaders, has asked Rubio to lead talks on providing Ukraine with security guarantees.