RIGA, Dec 19 (Reuters) - Ukraine's President Volodymyr Zelenskiy on Monday asked Western leaders meeting in Latvia, including British Prime Minister Rishi Sunak, to supply a wide range of weapons systems to help end Europe's deadliest conflict since World War Two sooner.While Western allies, led by the United States, have been supporting Ukraine with funding, military training and weapons, Kyiv has said still more was needed to tip the balance in its 10-month-old campaign against Russia in Ukraine's favour.The more successful our defence forces are, the faster the Russian aggression will fail," Zelenskiy said during his video link address to leaders of countries in the Joint Expeditionary Force (JEF), a British-led grouping of Northern European countries.But responding earlier to Ukrainian leader's plea, Sunak said the gathering aimed to focus on "how best we can continue to support you and get you everything that you need".Led by Britain, JEF is configured to respond rapidly to crises in the Northern Europe, and includes Denmark, Estonia, Finland, Iceland, Latvia, Lithuania, the Netherlands, Norway, and Sweden."