- Summary- Military chief breaks silence in article on Ukraine war- Claims rocket strikes on Russian bases in annexed Crimea- Expects war with Russia to run into 2023- Ukraine must match Russia's missile range, general saysKYIV, Sept 7 (Reuters) - In rare public comments Ukraine's military chief warned on Wednesday of the threat of Russia using nuclear weapons in Ukraine, which would create the risk of a "limited" nuclear conflict with other powers.The war in Ukraine that began with Russia's invasion on Feb. 24 was likely to rage on into next year, General Valeriy Zaluzhnyi said in an article co-authored by lawmaker Mykhailo Zabrodskyi and published by state news agency Ukrinform.The article contained by far the Ukrainian commander-in-chief's most detailed assessment of the war to date, and gave starkly contrasting messages to those given by top Ukrainian officials.Until now, Ukraine refused to publicly acknowledge its involvement, with a senior official speaking on condition of anonymity citing fears of Russian retaliation.Ukraine is not publicly known to have weapon systems in service with a sufficient range to hit Saky, which lies at least 200 kilometres from the front lines."