Britain’s Defence Secretary Ben Wallace has said he is “not optimistic” a Russian invasion of Ukraine can be stopped. Wallace, who is currently in Germany, told the BBC that he would soon meet with Russian Defence Minister Sergei Shoigu in Moscow. He said there was still “a chance” an invasion could be halted, but added, “I’m not optimistic.” Wallace told MPs on Tuesday that there were individuals already in Ukraine “linked to the Russian state in ways that are not conventional” and “that should give cause for concern.” “We are becoming aware of a significant number of individuals that are assessed to be associated with Russian military advance force operations that currently are located in Ukraine,” he told Parliament’s Foreign Affairs Committee. Also on Tuesday, Prime Minister Boris Johnson told the House of Commons that the UK is prepared to send troops to support NATO deployment and protect the alliance’s …