Poland pledged increased security along its border with Ukraine after Russian drone strikes near the frontier, with two drones landing within kilometers of Polish territory. Prime Minister Donald Tusk warned that Russia may intensify attacks that could spill into Polish territory. The warnings followed a Sunday strike on a train near the border and another near a separate crossing point. EU foreign policy chief Kaja Kallas said the attacks were meant to scare Western countries from supporting Ukraine.

This handout photo taken and released by the Ukrainian State Emergency Service on Sunday shows firefighters spraying water at a train carriage damaged by a drone strike near the border with Poland. AFP-Yonhap

WARSAW, Poland — Poland pledged increased security along its border with Ukraine after a wave of Russian drone strikes near the frontier, including two that landed within kilometers of Polish territory.

The move came as Polish Prime Minister Donald Tusk warned that Moscow appears poised to intensify its campaign against Ukraine’s borders with European countries. Ukraine is under mounting pressure from Russia’s intensifying air campaign that uses ballistic missiles and jet-powered drones to pierce defenses.