The Ukrainian parliament on Sunday extended the period of martial law and general mobilization for an additional 90 days, until August 23, a sign that Kiev expects many more months of fighting. President Volodymyr Zelensky first imposed the drastic measures across Ukrainian territory on February 24, just hours after Russia’s invasion from the north, south and east. Martial law gives the military expanded powers and restricts civil liberties such as the right to demonstrate. Able-bodied men aged 18 to 60 were prohibited from leaving the country and urged to join the fight against the Russians. …