Secretary of State Marco Rubio believes the Russia-Ukraine war “has no military solution” but fears an increase in long-range exchanges could dramatically escalate the violence.

Speaking to Sen. Dick Durbin (D-IL) during a Senate Appropriations subcommittee hearing on Wednesday, Rubio offered a lengthy assessment of the Russian invasion. He noted specifically that “one thing that has changed” the nature of the conflict is Ukraine becoming “increasingly effective at conducting long-range strikes deep into Russia” and hitting “critical nodes of the Russian economy.”