Ukrainian President Volodymyr Zelenskyy has announced the establishment of a new cooperation format, the Carpathian Eight, bringing together Ukraine and seven European countries, as well as the EU as a bloc.

The White House is reportedly considering signing certain business deals with Russia even before Moscow ends its war against Ukraine, as a way of demonstrating its good intentions.

European Commission President Ursula von der Leyen has said that the European Union will provide Ukraine with an additional €3.3 billion to purchase missiles and drones and is preparing to launch a new programme of joint defence projects.

Slovenia's Foreign Minister Tone Kajzer and Defence Minister Valentin Hajdinjak arrived in Kyiv on 17 September.

Vladyslav Vlasiuk, Ukraine's Presidential Commissioner for Sanctions Policy, has welcomed the US House of Representatives' passage of a bill co-authored by Senators Lindsey Graham and Richard Blumenthal that would enable the introduction of "punitive tariffs" on countries buying Russian energy, saying the measure would help reduce Russia's oil revenues.

The US House of Representatives has passed a bill on sanctions against Russia backed by the late Republican Senator Lindsey Graham. The bill will now go to US President Donald Trump for his signature.

Polish Foreign Minister Radosław Sikorski has condemned Grzegorz Braun, leader of the far-right Confederation of the Polish Crown party, for recently damaging a memorial to Ukrainian Insurgent Army (UPA) fighters in the village of Białystok in Lublin Voivodeship, and said the politician belongs in prison.

Polish Foreign Minister Radosław Sikorski is insisting that Warsaw has nothing to do with Hungary blocking the opening of new clusters in Ukraine's EU accession negotiations.

Poland halted operations at Rzeszów and Lublin airports and issued an air-raid warning in several districts across two voivodeships due to an ongoing Russian air attack on Ukraine's western regions on the morning of 16 September.

Russian Ambassador to Denmark Vladimir Barbin has said that Russia plans to investigate the circumstances of an incident involving a helicopter being fired upon, but accused the Danish military of a "provocation" over its manoeuvres near a Russian frigate.

Germany's Federal Prosecutor's Office has announced charges of spying for Russia against a 57-year-old businesswoman from Berlin, who holds both German and Ukrainian citizenship and has already been in custody for more than six months.

Two young men have been detained in the Lithuanian capital of Vilnius after tearing down a Ukrainian flag from a flagpole on a building on Gediminas Avenue.

Europe has put forward a new proposal for using Russia's frozen assets to support Ukraine, seeking to address Belgium's concerns over the legal risks it could face from such a move.

Chișinău has dismissed Russia's claims that the Tudora-Starokozache checkpoint on the border with Ukraine is allegedly being used for military logistics and was therefore targeted by Russian forces.

President Volodymyr Zelenskyy is in Canada for a three-day visit accompanied by First Lady Olena Zelenska.

Italian Foreign Minister Antonio Tajani has urged Ukrainian President Volodymyr Zelenskyy to expand the group of European countries involved in peace negotiations, specifically by including Italy and Poland.

Germany's governing coalition is discussing possible measures against Russia following a drone incident at Leipzig airport, including the closure of the state-run Russian House cultural centre in Berlin.

Romania's acting Defence Minister Radu Miruță has said that the increasingly frequent drone incidents are a direct consequence of intensified Russian strikes on Ukrainian ports on the Danube.

Latvia issued an air-raid warning on the night of 13-14 August and shot down a drone that had violated the country's airspace, likely after Russian electronic warfare caused it to stray from its course.

During the Combined Resolve exercise in Germany, Ukrainian drone operators from the Nemesis unit – the 412th Brigade of Ukraine's Unmanned Systems Forces – quickly detected and simulated strikes on vehicles belonging to a US mechanised brigade, demonstrating their advantage in the use of drones.