Ukraine's President Volodymyr Zelenskyy says Ukrainian forces are holding back a concerted summer push by Russia's bigger army to break through defenses along parts of the front line. He says Ukraine has thwarted Russian efforts to get into Pokrovsk in the eastern Donetsk region. He says the situation has also improved in the northeastern Sumy border region. Analysts say Russia has recently made only incremental gains in its slow and costly advance against Ukrainian defenses. With the war now in its fourth year after Russia's February 2022 invasion of its neighbor, the effort is draining resources on both sides, although Russia can sustain the fight for longer while Ukraine seeks further support from Western partners.