Tensions Escalate Over US-Russia Summit Cancellation
Medvedev called US Russia's adversary. Trump's Ukraine actions deemed act of war. US Treasury sanctioned two Russian oil firms and canceled summit. Medvedev criticized US as hostile 'peacemaker'. Russia demands Ukraine be neutral, non-aligned, demilitarized. Sanctions, summit cancellation, military moves heighten tensions. Trump ordered submarines closer to Russia. European leaders warn of NATO threats