How Ukraine is taking the war 'deeper' into Russia

Ukraine has struck 2 lipid refineries in Russia. President Volodymyr Zelensky said it was to bounds lipid revenues Moscow "uses to finance" its war. The strikes constitute the latest escalation in a conflict where attacks have reached deep inside Russian territory. In recent weeks, fighting between Russia and Ukraine has intensified, while mediation efforts have yielded no results. The BBC's Dan Johnson explains the actions Kyiv has taken to create meaningful pressure on Russia.