Vin Diesel, star of US action films, has urged the Russian President to take the challenge, but his spokesperson says he's busy.
A three-year-old girl has been found after surviving 10 nights in the Siberian wilderness after her puppy left her side to fetch help.
An opening in the earth in gas-rich northern Siberia could have been caused by a natural underground explosion
The European Union's foreign policy chief Catherine Ashton says she wants to ensure Ukraine can safeguard its territorial integrity.
Speaking at the start of high-level talks in Minsk, Ashton said she wanted to "try and support the people of Ukraine to find peace and security, to ensure that they are able to enjoy territorial integrity".
She said Ukraine needed a "future that is economically viable" with "growing and good relations with the neighbours."
Earlier, Russian president Vladimir Putin and Ukraine's Petro Poroshenko shook hands at the meeting - their first since June.
Russia's President Vladimir Putin and Ukraine's President Petro Poroshenko have shaken hands and posed for a photograph together at the start of high-level talks in Minsk over the Ukraine crisis.
It is the first time the two presidents have met since June.
Ukrainian President Petro Poroshenko has said that peace in Ukraine could be the result of a meeting today with Russian President Vladimir Putin at the Minsk summit.
"I sincerely hope that the result of today's meeting - and I think it won't be the only meeting, just the first one - will be peace," He said.
"The Bible says that peacemakers are blessed, so if we with our colleagues are able to reach an agreement today which would bring peace to Ukrainian land I think it would be a pivotal event."
Russian President Vladimir Putin has arrived in Belarus ahead of a summit with Ukraine and members of the European Union.
Putin and his Ukrainian counterpart Petro Poroshenko are expected to hold rare talks on the ongoing Ukraine crisis during the summit.
Ukraine has claimed Russian Mi-24 helicopters attacked a border post in the Luhansk region yesterday killing four border guards.
– Ukrainian military spokesman Andriy Lysenko speaking to Reuters
Yesterday, during the day, at the border post of Krasnatalovka, Russian Mi-24 helicopters attacked Ukrainian border guards.
As a result of the attack, four guards were killed, three were injured.
Ukraine has said Russian soldiers captured after crossing the border were on a "special mission," contradicting a Russian defence ministry source's claim that it was accidental, Reuters reported.
"This wasn't a mistake, but a special mission they were carrying out," Ukrainian military spokesman Andriy Lysenko said.
Lysenko also claimed that pro-Russian separatists were attacking the southeastern border town of Novoazovsk "at this very minute."
He added that 12 Ukrainian service members had been killed during fighting in the past 24 hours.
Ukraine security officials have released a video they claim shows Russian paratroopers that were captured after crossing the border.
One of the men, who identified himself as Ivan Milchakov, said, "I did not see where we crossed the border. They just told us we were going on a 70 km (45-mile) march over three days."
"Everything is different here, not like they show it on television. We've come as cannon fodder," he said in the video.
Another man in the footage, who gave his name as Sergeant Andrei Generalov, reportedly said, "Stop sending in our boys. Why? This is not our war."
Ukrainian President Petro Poroshenko has arrived in Belarus ahead of a summit with Russia and members of the European Union.
Russian President Vladimir Putin and Poroshenko are expected to hold rare talks on the ongoing Ukraine crisis during the summit.
The Russian servicemen captured in Ukraine crossed the border into the country by mistake, the Itar-Tass news agency reported, citing an unnamed source at the Russian defence ministry.
Ukraine's security service says its army has captured ten Russian paratroopers in the east of the country, the Agence France-Presse news agency reports.
The organisation said the servicemen were now being questioned as part of a criminal probe after being discovered on Ukrainian soil near the village of Dzerkalne, about 30 miles south-east of rebel stronghol Donetsk.