Russia will not immediately raise oil output after the United States ends sanctions waivers for buyers of Iranian crude in May, President Vladimir Putin said Saturday.

The United States announced this week that, in a bid to reduce Iran's oil exports to zero, it would from May 2 end US waivers that countries such as India, China, South Korea and Turkey currently have on buying Iranian crude.

Russian President Vladimir Putin said Saturday Moscow was "thinking" of making it easier for all Ukrainians to obtain Russian citizenship after the Kremlin moved to grant passports in the country's separatist east, causing uproar in Kiev.  

North Korean leader Kim Jong Un left the Russian city of Vladivostok on Friday after a summit with Russian President Vladimir Putin where the two vowed to pursue closer ties.

North Korea's close relationship with the Soviet Union cooled in the 1990s under a new Russian power, but were revived in the 2000s as Moscow sought support amid a new standoff with the West. 

Russian President Vladimir Putin and North Korean leader Kim Jong Un vowed to seek closer ties as they met face-to-face Thursday for the first time.

President Vladimir Putin on Wednesday signed a decree making it easier for people living in eastern Ukraine's separatist territories to obtain a Russian passport.

The decree, published on the Kremlin website, is aimed at residents of the unrecognised Donetsk and Lugansk republics that broke away from Kiev in 2014 and are governed by Moscow-backed rebels.

North Korean leader Kim Jong Un arrived in Russia's Pacific port city of Vladivostok on Wednesday for a first summit with Vladimir Putin, as Pyongyang seeks support in its nuclear deadlock with the United States.

Turkey is "taking into account" NATO concerns over its Russian missile deal, the country's foreign minister said on Friday, in more conciliatory remarks over a purchase stoking tensions between Washington and Ankara.

Russia on Friday once more dismissed the Mueller report, saying it failed to present clear evidence of any meddling by Moscow in the 2016 US election and called its impact on relations regrettable.

Russian lawmakers on Thursday approved in a key second reading a controversial bill that would allow Moscow to cut off the country's internet traffic from foreign servers.