Markets are starting the week with geopolitics dominating as European leaders assemble what Britain called a “coalition of the willing” to secure Ukraine following an Oval Office clash between Trump and Ukrainian President Volodymyr Zelenskiy. The euro gained and defense stocks rallied as a concerted push by European leaders fueled bets on a wave of military spending. Defense stocks soared, boosting the market capitalization of the sector by about $30 billion in Monday’s session as BAE Systems,