New Delhi, Jan. 1 -- Leaders from Europe and Canada held talks Tuesday on U.S.-led peace efforts to end the nearly four-year war between Russia and Ukraine, as Moscow and Kyiv sparred over Russian claims, denied by Ukraine, of a mass drone attack on a lakeside residence used by President Vladimir Putin.

The virtual meeting included European leaders as well as Canadian Prime Minister Mark Carney, heads of European institutions and NATO Secretary-General Mark Rutte, according to Polish Prime Minister Donald Tusk.

"Peace is on the horizon," Tusk told a Polish Cabinet meeting. But he added: "It is still far from a 100% certainty."

It was the first meeting of European leaders since U.S. President Donald Trump hosted Ukrainian President Volo...