Answer
The Time of Troubles, a period of political instability and social upheaval, followed Feodor's death in 1598. With the end of the Rurik dynasty, a power vacuum ensued, leading to conflicts among boyar factions and the rise of several pretenders to the throne. This tumultuous era marked by foreign interventions and internal strife severely weakened the Russian state and paved the way for the eventual rise of the Romanov dynasty.