Volodymyr Zelensky said Kremlin officials ought to know where the bomb shelters were in Russia, a threat Kremlin dismissed.

Talking to Axios, Zelensky said the centres of Russian power, like the Kremlin, were potential targets and that Kremlin officials "have to know where the bomb shelters are".

Dismissing the warning, Kremlin spokesperson Dmitry Peskov said that Ukraine was losing the war and its negotiating position was worsening.

"Zelensky is trying to demonstrate to the Europeans, who now act as the breadwinners, that he is such a brave soldier," Peskov told state television.

"Meanwhile, the state of affairs at the front indicates the opposite. With every passing day, the situation for Ukraine is inexorably deteriorating. And every day Ukraine's negotiating positions are inexorably deteriorating."

A recent assessment shared by US president Donald Trump and vice president JD Vance suggested that Russia was not doing well on the frontline.

When asked directly by how the Kremlin would perceive an attack on the centre of Russian power, Peskov said that "it's better not to even talk about it".

US president Donald Trump has authorised Ukraine to carry out long-range strikes into Russia, the US special envoy to Ukraine General Keith Kellogg said.

“I think reading what he has said, and reading what vice president Vance has said as well as secretary Rubio, the answer is yes. Use the ability to hit deep. There are no such things as sanctuaries," he told Fox News last night.

The top diplomat working on brokering an end to the war in Ukraine was answering a question if the president Trump’s position is that Ukraine can conduct long-range strikes into Russia.

The Nato member ordered a ban on civil drone flights yesterday after drones were observed at several military facilities overnight, following a week in which drone sorties caused the temporary closures of several Danish airports.

The Danish military said in a statement it had deployed "several capacities" in response to the overnight sightings at bases, declining further comment on the nature of its response.

Denmark called the drones part of a "hybrid attack". It stopped short of saying definitively who it believed was responsible, but prime minister Mette Frederiksen previously suggested it could be Moscow, calling Russia the primary "country that poses a threat to European security". The Kremlin denied any responsibility.

The ban bars civilian drones from Danish airspace from Monday through Friday of this week when Denmark, which holds the rotating presidency of the EU for the second half of this year, will be hosting European leaders.

Denmark will host EU leaders on Wednesday, followed by a summit on Thursday of the wider, 47-member European Political Community, set up to unite the EU with other friendly European countries after Russia's 2022 invasion of Ukraine.

A German air defence frigate arrived in Copenhagen on Sunday to assist with airspace surveillance during the high-profile events.

Moldova's pro-European Union ruling party pulled comfortably ahead of its Russian-leaning rival in a crucial parliamentary election as final results firmed up on Monday, a relief for the government as it seeks to stay out of Moscow's orbit.

With more than 99 per cent of votes counted, the Party of Action and Solidarity (PAS) had a share of 49.99 per cent, versus 24.28 per cent for the Patriotic Bloc, which opposes closer ties with Brussels.

Moldova – a former Soviet republic of 2.4 million people that has been buffeted by the war in neighbouring Ukraine, alleged Russian interference and energy shortages – has long vacillated between Russia and Europe.

The remaining distribution of votes cast suggests PAS could secure the critical majority it needs in the 101-seat chamber to avoid a potentially shaky coalition and keep Moldova's EU bid on track, a process requiring years of legislative efforts.

Russia's air defence units destroyed 84 Ukrainian drones overnight, Russian defence ministry said this morning, reported RIA news agency.

Russia's invasion of Ukraine has stalled with little in the way of territorial gains recently, US vice president JD Vance has said.

"We've been actively pursuing peace from the very beginning of the administration, but the Russians have got to wake up and accept reality here. A lot of people are dying. They don't have a lot to show for it," he said.

The US was considering Ukraine's request to obtain Tomahawk missiles for use against Russia, vice president JD Vance said.

Ukrainian president Volodymyr Zelensky had asked the US to sell Tomahawks to European nations that would send them to Ukraine.

Vance said on Fox News yesterday that president Donald Trump would make the "final determination" on whether to allow the deal.

"We're certainly looking at a number of requests from the Europeans," he said.

Tomahawk missiles, which have a range of 2,500km, would be a powerful asset in Ukraine's arsenal to fight back against regular barrages of Russian missile and drone attacks.

Ukraine getting such a weapon, however, would almost certainly be seen by Russia as an escalation.

One recent incursion was in Aalborg airport, in north Denmark, which closed on Friday following the drone sightings, while Esbjerg, Sonderborg and Skrydstrup regions all remained open despite similar incidents.

They came just two days after Danish prime minister Mette Frederiksen refused to rule out Russian involvement when drone sightings forced Copenhagen airport into shutdown for four hours, in what she described as a “serious attack on critical Danish infrastructure”.

Reporter Alex Ross looks at the ongoing threat: