Austria's Ministry of Foreign Affairs has expelled a Russian embassy employee after a spying scandal at Austrian oil, gas and chemicals group OMV.

Ukrainian President Volodymyr Zelenskyy has proposed the establishment of a joint system of protection against aerial threats, which Poland and other partners of Ukraine could join.

NATO Secretary General Mark Rutte has said he supports US President Donald Trump’s position on the need to shoot down Russian aircraft violating the Alliance’s airspace.

Ukraine is set to begin search and exhumation work on Polish territory at the end of September as part of bilateral cooperation for the reburial of Ukrainian and Polish citizens.

Four Russian military aircraft entered the Alaskan Air Defense Identification Zone (ADIZ) on 24 September, prompting the US to scramble its own aircraft to escort them.

Bulgarian Prime Minister Rosen Zhelyazkov has said that Bulgaria will terminate its contract for the transit of Russian gas in 2026.

Ukrainian President Volodymyr Zelenskyy has called on Europe to increase its support for Moldova amid attempts by Russia to draw it into its sphere of influence.

US Secretary of State Marco Rubio has ruled out the possibility of downing Russian aircraft violating NATO airspace unless they engage in aggressive actions.

Ukrainian President Volodymyr Zelenskyy held a phone conversation with NATO Secretary General Mark Rutte on Monday 22 September, focusing on the need for "real protection against Russian strikes".

NATO is prepared to respond to violations of its airspace by Russian military aircraft, UK Foreign Secretary Yvette Cooper has said.

Olha Stefanishyna has officially assumed her duties in the United States on 15 September.

Hungarian Foreign Minister Péter Szijjártó has said he will hold talks with his Ukrainian counterpart Andrii Sybiha in Budapest in the coming days.

Slovak Prime Minister Robert Fico will meet with Ukrainian President Volodymyr Zelenskyy on Friday 5 September in the city of Uzhhorod in Zakarpattia Oblast (Transcarpathia) in Ukraine's west.

Yuri Ushakov, an aide to Kremlin leader Vladimir Putin, has said that there are no agreements between Moscow and Washington regarding a meeting between Ukrainian President Volodymyr Zelenskyy, US President Donald Trump and Putin.