Two RAF jets were scrambled in the early hours of Saturday morning to respond to the threat of Russian drones on the Nato border.
The Romanian defence ministry said it recovered drone fragments in the southeastern city of Galati after an overnight Russian attack on neighbouring Ukraine, with an electricity âpole and a household annex damaged.
It is understood that two Eurofighter Typhoons were scrambled from Borcea Air Base in Romania, which shares a 650-km land border with Ukraine â and has seen Russian drones repeatedly breach its airspace as Moscow attacks Ukraine ports on âthe other side of the Danube river.
However, MoD sources stressed that RAF Typhoons did not enter Ukrainian airspace, nor did they engage any Russian assets. The two aircraft have now returned to base.
Romanian emergency services were forced to evacuate the area where drone fragments were recovered over fears they could contain explosives. The fragments will now be disposed of in a secure location.
While drone fragments have routinely fallen on Romania, Saturday âmarked the first time property had been damaged.
"The defence ministry firmly condemns the irresponsible actions of the Russian Federation and emphasises that these represent a new challenge to regional security and stability in âthe Black Sea area," the Romanian defence ministry said in a statement.
"Such incidents demonstrate the Russian Federation's lack âof respect for the norms of international law and endanger not only the safety of Romanian citizens, âbut â also the collective security of NATO."
It comes amid mounting tension âalong Europe's eastern flank âin recent months â after suspected Russian drones breached the airspace of several Nato states.
Romanian law allows it to shoot down drones during peacetime if lives âor property are at risk, but it has not yet âdone so.
Overnight on Saturday, Russian forces launched more than 600 drones and 47 missiles across Ukraine, the countryâs air force said.
At least four people were killed and more than 30 wounded across Ukraine, Volodymyr Zelensky said, calling for âimmediate and decisive actionâ from partners.
It comes amid fears that Vladimir Putin could make progress in his offensive in Ukraine as the worldâs attention is diverted to the Middle East, with the Russian president profiting off soaring gas and oil prices caused by the Iran war.
Last month, defence secretary John Healey confirmed that the UK and allies tracked a Russian attack submarine and two spy submarines loitering over critical undersea cables in the North Atlantic for a month before they retreated.
He said Putin had sought to capitalise on the world being âdistractedâ by the Iran war and that he poses âthe primary threat to UK securityâ.
Mr Healey told a press conference in Downing Street on Thursday that in the past few weeks â while many eyes were trained on the Middle East crisis â the UK, in partnership with Norway and other allies, responded to âincreased Russian activityâ in the Atlantic north of the UK.
Addressing the Russian president, Mr Healey said: âWe see your activity over our cables and our pipelines, and you should know that any attempt to damage them will not be tolerated and will have serious consequences.â