Burgas is Bulgaria's only oil refinery, and was a key part of Lukoil's foreign business empire, which is being threatened after the US joined Britain last month in imposing sanctions on Russia's two largest oil companies over Moscow's war in Ukraine.

The US withdrew from the ABM treaty in 2002. Putin publicly revealed the existence of super weapons like the Poseidon and Burevestnik in 2018. He framed it as a response to the US pursuing missile defence and NATO expansion.

This week alone, the Russian president unveiled two nuclear-capable weapons - but their value may be more symbolic than military.

The two leaders reached an agreement on fentanyl, some tariffs and rare earths, at least for a year. But even as the global trade picture cleared a little, Mr. Trump spurred new worries about nuclear proliferation.

A new film illustrates the need for public engagement and outcry about the continued threat of nuclear weapons, the Bulletin of the Atomic Scientists’ former Gov. Jerry Brown and Alexandra

As Zelenskyy lauds Europe and the U.S. for ramping up economic pressure on Putin over the war in Ukraine, Moscow dismisses them as a counterproductive "act of war."