Putin announced successful Poseidon nuclear drone testing as President Donald Trump urged Russia to end the Ukraine war instead of testing missiles on Monday.

President Vladimir Putin says Russia has conducted a successful test of a new atomic-powered and nuclear-capable underwater drone, declaring that the new weapon can't be intercepted.

The Trump administration has lifted sanctions on a kleptocratic ally of Russian President Vladimir Putin, who was removed this month as president of the Serb territory within Bosnia and Herzegovina for chipping away at the US-brokered peace deal that ended bloody ethnic violence in the Balkans in the 1990s.

Vladimir Putin tightens grip on power by promoting family members and younger allies to his inner circle as economic strain and opposition threats mount in Russia.

The United States cancelled a planned Budapest summit between President Donald Trump and Russian President Vladimir Putin following Russia's firm stance on hardline demands regarding Ukraine, the Financial Times reported on Friday.

Dr Yury Baranchik, a prominent Russian geopolitical commentator, has advised Vladimir Putin to strike a British warship with nuclear weapons

Though Trump said his October 16 call with Putin was “very productive”, the Russian leader annoyed his US counterpart by extolling Moscow’s supposed battlefield successes near the eastern Ukrainian city of Kupiansk and the Oskil river, said two people briefed on their conversation.

While Donald Trump’s primary objective during Thursday’s summit with Xi Jinping was to negotiate a favourable trade deal, there is also the tantalising prospect that it could help to achieve a breakthrough in his efforts to end the war in Ukraine.

The Kremlin has issued a stern warning to the US after President Trump announced plans to resume nuclear weapons testing, saying Russia would "act accordingly"

President Vladimir Putin is voicing concern about the ongoing internal problem of “falling birth rates” in his own country and suggesting state action to address the issue.

ABC News' Luis Martinez and contributor Mick Mulroy discuss President Donald Trump's order to put the U.S on equal basis with other countries on nuclear weapons testing.