Cardinals return to the Sistine Chapel on Thursday to resume voting for a new pope after the first conclave ballot failed to find a winner, sending billowing black smoke through the chapel chimney.

Some of the 133 voting cardinals had said they expected a short conclave to replace Pope Francis. But it will likely take a few rounds of voting for one man to secure the two-thirds majority, or 89 ballots, necessary to become the 267th pope.

One person was killed early Thursday in Russian attacks in northeast Ukraine, in the opening hours of a 72-hour ceasefire called by Russian President Vladimir Putin.

Another two people were injured after Russian forces dropped guided air bombs in the northeast Sumy region.

India's government said Thursday that 13 civilians had been killed by Pakistani fire in "ceasefire violations" along their de facto border since Wednesday, after violence escalated into artillery shelling following Indian strikes.

India's foreign ministry said that all those killed were in the town of Poonch, with 59 others injured, the majority also in the town.

Chinese President Xi Jinping on Thursday hailed "deepening" trust with Russia as he sat down with President Vladimir Putin at the Kremlin.

"The political mutual trust between China and Russia is becoming deeper, and the ties for pragmatic cooperation are becoming stronger," Xi said, visiting Moscow for Russia's May 9 celebrations of the World War II defeat of the Nazis.

Turkey on Wednesday warned of a risk of "all-out war" between India and Pakistan, after the worst violence between the nuclear-armed neighbors in two decades.

"The attack carried out last night by India runs the risk of an all-out war," said a foreign ministry statement after India's deadly missile strikes. "We condemn this provocative initiative as well as the attacks targeting civilians and civilian infrastructure."

French President Emmanuel Macron announced Wednesday the creation of a "French-German defense and security council" as Germany's new Chancellor Friedrich Merz visited Paris.

Deadly clashes between India and Pakistan have prompted concern and calls for restraint from around the world on Wednesday.

Attacks by Ukrainian long-range drones caused flight disruption at Moscow's main airports for a third straight day on Wednesday, authorities said, as Russia prepared to receive the Chinese president and other foreign leaders for the annual Victory Day military parade in Red Square.

India and Pakistan exchanged heavy artillery fire along their contested frontier on Wednesday after New Delhi launched deadly missile strikes on its arch-rival, in the worst violence between the nuclear-armed neighbors in two decades.

Russia will stick to its plans to halt fire on Ukraine between May 8-10, but will respond to attacks by Kyiv's forces, the Kremlin said Tuesday, days after Ukraine's Volodymyr Zelensky dismissed the truce proposal as a "game" and "manipulation".

"President (Vladimir) Putin's initiative for a temporary ceasefire," remains in force, the Kremlin's spokesman Dmitry Peskov told reporters, but added that "an adequate response will be given immediately" if Ukraine does not also halt combat operations.