A Russian drone has struck a passenger train near Ukraine's border with Poland shortly after former British Prime Minister Boris Johnson and senior European security officials travelled through the area on another train.

The attack hit a locomotive at Yahodyn, approximately two kilometres from the Polish border, according to Ukrainian and Polish authorities.

No casualties were reported after passengers on the affected train were evacuated shortly before the strike.

Ukraine's state railway company Ukrzaliznytsia said an evacuation order was issued about 15 minutes before the Russian jet propelled drone hit the train.

DIPLOMATIC TRAIN LEFT EARLIER THAN EXPECTED

Johnson and several senior European officials had been travelling back from Kyiv after attending the Yalta European Strategy conference.

Among those travelling through the railway corridor were senior European security officials, including UK National Security Adviser Jonathan Powell.

Ukrzaliznytsia said the diplomatic train departed the station earlier than originally scheduled because timetables were being adjusted in response to continuing threats of Russian attacks.

The railway operator said it was possible that the diplomatic train had been the intended target of the drone strike.

However, there has been no independent confirmation that Russia deliberately targeted Johnson or the other officials.

Russia said its forces targeted railway infrastructure in western Ukraine used to facilitate the transportation of military cargo from Europe.

FORMER CIA CHIEF DESCRIBES ATTACK AS TERRIFYING

Former CIA Director David Petraeus was also travelling in the area and was aboard another train at Yahodyn station around the time of the attack.

Petraeus described the incident as terrifying and condemned the continuing attacks on Ukrainian infrastructure.

Former Swedish Prime Minister Carl Bildt, who had also attended the Kyiv conference, said passengers aboard his train were instructed to prepare for an evacuation.

The warning was later lifted and the train was allowed to continue its journey, eventually arriving safely at Dorohusk in Poland.

JOHNSON CONDEMNS RUSSIAN STRIKE

Johnson condemned the attack and called on Ukraine's allies to provide additional air defence systems.

He described attacks on Ukrainian civilian railway infrastructure as senseless and argued that Ukrainians continue to face such threats as part of their everyday lives during the war.

The former British prime minister has remained a prominent supporter of Ukraine since Russia launched its full scale invasion.

ATTACK JUST TWO KILOMETRES FROM POLAND

The location of the strike has also raised concern because of its proximity to Poland, a member of both NATO and the European Union.

Ukrainian Foreign Minister Andrii Sybiha said Russia's attacks were moving dangerously close to the borders of NATO and the European Union and renewed calls for stronger international pressure on Moscow.

Polish Prime Minister Donald Tusk convened an emergency meeting following the developments near the border.

The train attack came amid a wider series of Russian strikes across Ukraine and growing concern over attacks targeting transport and logistics infrastructure close to Ukraine's western borders.

Russia maintains that its military targets infrastructure supporting Ukrainian military operations and Western military supplies.

The incident at Yahodyn is now likely to intensify calls from Kyiv for additional air defence capabilities as Russian long range attacks continue.