Russian leader warns his military has 'sufficient stockpile' of such weapons, has right to take 'reciprocal' action if targeted

Ukrainian president visits Black Sea land mass where defenders famously defied a Russian warship at the beginning of the invasion; Turkey's Erdogan backs Ukraine joining NATO

Washington says Kyiv vowed to use weapons carefully; US to send version with reduced 'dud rate,' meaning fewer smaller bomblets fail to explode, later cause unintended deaths

Ukraine is only place in the world where such munitions are currently deployed, Cluster Munition Coalition says, adds that Kyiv also used cruel weapon at least 3 times during war