KYIV (Reuters) – Ukraine International Airlines (UIA), the country’s biggest carrier, said on Monday it had leased out its medium-haul Boeing 737-900 aircraft to Latvian carrier airBaltic to try to minimise its losses caused by Russia’s invasion of Ukraine. The company stopped operating services on Feb. 24 after Russia invaded Ukraine, targeting airports and other critical infrastructure and prompting the government in Kyiv to introduce martial law and close its skies to commercial aviation. “From May 1, the aircraft and crews of the Ukrainian airline will be based at Riga Airport to serve the…