US president Joe Biden’s last-gasp decision to permit Ukraine to fire western-made, long-range missiles at military targets deep inside Russian territory runs the risk of triggering a sharp increase in retaliatory sabotage, such as cyber and arson attacks on Britain and its European Nato partners.

Vladimir Putin, who ordered the full-scale, illegal invasion of Ukraine 1,000 days ago tomorrow, has long warned that Kyiv’s expanded use of US-, British- and French-made missiles would be viewed by Moscow as an act of war by Nato, and could trigger catastrophic consequences. Now Putin’s bluff, if it is a bluff, is being called.

Much the same may be said of Keir Starmer and the EU. A joint statement by G7 leaders, coinciding with the 1,000-day landmark, pledged “unwavering support for Ukraine for as long as it takes”. Starmer reiterated that commitment en route to this week’s G20 summit in Brazil. Exactly what it means in practice may soon be harshly tested.

Biden’s decision is welcome, if overdue. Amid grinding Russian ground advances, EU feuding and Donald Trump’s unpropitious re-election, the war has reached a critical juncture, militarily and diplomatically. The outcome is in the balance as the scales momentarily tip towards more death and destruction, then back towards some form of Trump-imposed land-for-peace sell-out.

Russia has the advantage at present. But Kyiv will not and must not give up.

Biden was slow to give the missile go-ahead, despite months of pressure from President Volodymyr Zelenskyy, who has argued, with good reason, that Ukraine is fighting with one hand tied behind its back. Russian airfields, military bases and command centres that are used to mount almost daily, lethal missile and drone attacks on Ukraine’s cities and energy........

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