Ukraine’s ambassador to NATO on Wednesday urged European allies to step up purchases of US weapons for Kyiv, as only Washington can supply key capabilities required to counter Russia’s assaults. “European NATO member states are not able to substitute either by types or by volume or speed of delivery,” ambassador Alyona Getmanchuk told AFP. JOIN US ON TELEGRAM Follow our coverage of the war on the @Kyivpost_official . “It’s not that we prefer American weapons over French or German or some other