Jailed Ukrainian pilot Nadiya Savchenko has resumed her hunger strike and is withering away, her lawyer said on Monday, adding that authorities planned to transfer her to a Russian civilian hospital.

Lawyer Nikolai Polozov said that Savchenko, who had already lasted for more than 80 days without food before halting her hunger strike last month, has again been refusing food since last week.

British prosecutors said Monday they had charged Soviet dissident Vladimir Bukovsky with making and possessing indecent images of children.

Bukovsky, 72, faces a total of 11 charges and will have to attend court next week on May 5, the Crown Prosecution Service (CPS) said in a statement.

Ten pro-Kremlin bikers on a controversial ride to Berlin to celebrate Soviet victory in World War II were on Monday denied entry into Poland at the Belarusian border, Polish border guards said. 

The bikers include members of the Night Wolves, a fiercely nationalist club closely linked to Russian President Vladimir Putin.

European leaders on Monday resisted Ukraine's demands for peacekeepers to stabilize its war-torn east, as monitors reported a surge in shelling near a strategic government-held city.

Top European Union officials at a summit with the former Soviet state did however agree to boost humanitarian support as Kiev fights separatists in the east whom its Western allies accuse Russia of backing.

Russian President Vladimir Putin said in an interview broadcast Sunday that he had no regrets over Moscow's 2014 annexation of Crimea and that it was righting a historical injustice.

"I think we did the right thing and I don't regret a thing," Putin said of his decision to take back the Black Sea peninsula from Ukraine, interviewed in a state television documentary.

Russian President Vladimir Putin said he can "completely imagine" leaving the Kremlin for a more modest abode and does not consider himself a member of his country's elite.

"If someone can return to an ordinary flat and live there instead of in palace interiors, I think he has not lost contact with the outside world," Putin said in an interview broadcast Sunday on state television. "I can completely imagine life outside this position."

Russian President Vladimir Putin in a documentary broadcast Sunday accused the United States of directly contacting and providing logistical support to North Caucasus separatist militants.

In the documentary "President," which has already been broadcast in far eastern Russia on Rossiya 1 television, Putin made the claim, citing intelligence from Russian special services, to state that it occurred in the early 2000s.

Emails to and from President Barack Obama were read by Russian hackers last year in a breach of the White House's unclassified computer system, The New York Times said Saturday.

Earlier this month, U.S. officials admitted there was a cyber "event" late last year, but refused to confirm reports Russia was behind the attack.

Turkish President Recep Tayyip Erdogan on Saturday lashed out at the European Union and world leaders who have recognized the 1915 massacres of Armenians as genocide on the centenary of the events. 

Erdogan accused the leaders of France, Germany and Russia of "supporting claims based on Armenian lies" after they described the slaughter of an estimated 1.5 million Armenians by Ottoman forces as genocide -- which Turkey strongly objects to. 

Russia is failing to fully implement a ceasefire deal agreed in eastern Ukraine despite its hopes of seeing European sanctions eased, U.S. Secretary of State John Kerry said Friday.

The top U.S. diplomat said he challenged his Russian counterpart in a phone call earlier this week about Russian convoys and equipment in eastern Ukraine "because it is clear at this point in time" that the Minsk ceasefire deal "has not been lived up to sufficiently."