Polish Prime Minister Donald Tusk announced that Poland will host joint military exercises with British and French forces this autumn to strengthen security guarantees for Ukraine. Tusk also warned that Russia could escalate the war and said Poland is preparing for a possible long-term presence of allied troops. Meanwhile, Kremlin spokesperson Dmitry Peskov dismissed new European sanctions as "illegal" and rejected accusations of Russian cyberattacks. Peskov also criticised European plans to discuss Ukraine's future security without Moscow, calling such proposals a "dead-end." Watch the latest face-off between NATO allies and the Kremlin over Ukraine and regional security.