Business Insider got access to a NATO AWACS flight for an eight-hour surveillance mission over Eastern Europe.

A White House spokeswoman said Vladimir Putin had agreed to a meeting with Volodymyr Zelensky, but Russia has not confirmed. President Trump said American troops would not be deployed in Ukraine.

General Christopher Donahue, commander of U.S. Army Europe and Africa, said allies could seize Kaliningrad "in a timeframe that is unheard of."

Russia is refusing to commit to a meeting between Ukrainian President Volodymyr Zelensky and Russian President Vladimir Putin, which President Trump has encouraged as a next step toward ending the war between their two countries.

NATO Secretary General Mark Rutte said on Monday NATO membership for Ukraine was not under discussion but that there was a discussion on "Article 5" type security guarantees for the country that Russia invaded in February 2022.

Fighter jets from NATO nations took to the skies, following long-range Russian missile strikes on Ukraine overnight.

Rather than exploiting Russia’s weaknesses, a drone-centric NATO could be playing to Russia’s strengths, some experts warn.

For Putin, the war in Ukraine is not only about Kyiv's independence, it's about preserving Russia's power over former Soviet states.