Pope Leo XIV has been pictured celebrating Mass from hospital, in the first images of him released by the Vatican since he underwent lung surgery.

The 71-year-old pontiff was diagnosed with lung cancer after the surgery at Rome’s Gemelli Hospital on Tuesday afternoon, which the Vatican said had been “successful” and proceeded without complications.

The images shared on Friday showed the Chicago-born Pope wearing a green robe while standing behind a makeshift altar on the tenth floor of the hospital.

Pope Leo “celebrated with the medical and nursing staff” and thanked workers for their service, the Vatican press office said.

Also on Friday, the Pope phoned Russian President Vladimir Putin from hospital to urge a ceasefire in the Russian-occupied Ukrainian city of Oleshky, where access to food and water has been cut off for thousands.

“The fact that he accepted the call and spoke with the Pope may, I hope, be a sign that the Pope’s request will indeed be carried out,” said Cardinal Pietro Parolin, the Vatican’s secretary of state.

Without mentioning a ceasefire, the Kremlin said: “The Vatican’s intention to help create the conditions necessary to ensure the safety of the town’s population and to organise vital supplies has been supported”.

“It has been agreed to cooperate on this matter,” it added.

The UN High Commissioner for Human Rights, Volker Turk, made a similar plea to address what he described as a “desperate” situation in Oleshky.

The Pope’s doctors said on Friday tests had shown “a steady improvement in his general condition” since his surgery.

His doctors said that a chest X-ray indicated “good recovery of the operated lung”.

The whole lower lobe of the Pope’s right lung was removed “to ensure the procedure was radical”, the Vatican said following the surgery.

“After the operation, the Pope awoke normally and returned after a brief period of observation to his room,” it said earlier, before he spent a “peaceful night” at the hospital.

Pope Leo first announced that he would be having the operation during his weekly Sunday prayers, telling the crowd in St Peter’s Square that doctors had found a “well-contained” nodule on his lung “at an early stage” and advised him to have it removed.

Nodules are quite common and not necessarily cancerous, but after it was examined the medical team confirmed it was, “as suspected by pre-operative tests”, the Vatican said. He was diagnosed with lung adenocarcinoma.

The Vatican has stressed that the Pope had shown no symptoms of infection or illness prior to the procedure.

Additional reporting by Joel Guinto