Russian strongman Vladimir Putin is set to host a special envoy of North Korean leader Kim Jong-Un next week, a source said Friday, as Pyongyang is seeking allies to fend off a U.N. resolution on its human rights record.

Putin is set to hold talks with Choe Ryong-Hae early next week, after the top North Korean official arrives in Russia for an eight-day visit on Monday, a source said, on condition of anonymity.

Russia on Friday accused OSCE monitors of siding with the Ukrainian authorities, saying their attitude undermined trust in the international security organisation.

"Some aspects of the recent work of the OSCE Special Monitoring Mission to Ukraine are a cause for concern," the Russian foreign ministry said in a statement.

President Vladimir Putin on Friday slammed G20 member countries for imposing sanctions on Russia, saying this violated the group's principles, but said he did not plan to raise the issue at the summit in Australia.

Putin told the TASS state news agency in an interview published Friday, ahead of this weekend's G20 summit in Brisbane, that sanctions against Russia violated the G20's principles and were "harmful".

Sweden said Friday it had evidence that a mini submarine entered its waters in October, in a Cold War-style incident that triggering a week-long hunt fuelled by heated speculation of a Russian incursion.

"The Swedish defence forces can confirm that a mini u-boat violated Swedish territory. This is a serious and unacceptable violation by a foreign power," the Supreme Commander of the Swedish Armed Forces Sverker Goeransson told reporters.

Hungary's Prime Minister Viktor Orban on Friday dismissed corruption claims cited by Washington as the reason for U.S. entry bans on six senior Hungarian officials in October that have soured already frayed bilateral relations.

"This is just a scrap of paper," Orban on Friday morning in an interview with state radio, referring to a document published by the government on Thursday said to come from the U.S. embassy in Budapest.

Russia on Friday warned France of "serious" consequences unless Paris delivers by the end of this month a Mistral-class assault warship whose handover has been delayed by concerns over Moscow's role in the Ukraine crisis, a report said.

"We are preparing for different scenarios. We are waiting until the end of the month, then we will lodge serious claims," the state news agency RIA Novosti quoted an anonymous high-ranking Moscow source as saying.

British Ambassador Tom Fletcher has said that the election of a new president in Lebanon does not require the involvement of other countries, expressing disappointment at the failure of MPs to choose a head of state and warning of its dire consequences.

The constitution is clear in terms of the election of a new head of state, Fletcher told As Safir daily in an interview published on Friday.

Pentagon chief Chuck Hagel will unveil measures Friday designed to shore up the U.S. military's troubled nuclear force after a spate of embarrassing incidents exposed management and morale problems, officials said.

Hagel will present "a comprehensive action plan to reform the nuclear enterprise based on the results of two reviews he ordered last February," a senior defense official, who spoke on condition of anonymity, told AFP.

Russia could face further sanctions if it does not commit to resolving the conflict in Ukraine, British Prime Minister David Cameron said Friday, as he called Moscow's actions "unacceptable".

Cameron, who was in Canberra to address Australia's parliament, said existing sanctions imposed by the West were having an impact on Russia's economy.

The United States on Thursday said Russia had boosted its military flights near U.S. shores and brusquely warned Moscow to abide by international law.

Washington's concerns came only days after a European think tank warned that since Russia annexed Ukraine's southern Crimea peninsula earlier this year, "the intensity and gravity of incidents involving Russian and Western militaries and security agencies has visibly increased."