Several of the papers have focused on the Russian drone that hit a block of flats in Galati, Romania, on Friday, causing a fire and injuring two people. "Putin pushes Nato to the brink", declares the Independent, suggesting the alliance is "growing more vexed" as to how to respond to Russian incidents such as this. The Mirror leads with a quote from Prime Minister Sir Keir Starmer, who said on Friday that Russia's aggression in Europe "threatens the security of our entire continent". The paper's front page offers further details of the incident in Romania, which it says has been "condemned" by both European and Nato leaders. They "stand ready to defend allied states", the Mirror adds. A new breast cancer test could potentially spare millions of women from chemotherapy, according to the Guardian's top story.…