The arrival of the USS Theodore Roosevelt strike group in Busan came a day after South Korea summoned the Russian ambassador to protest a major deal between Russian President Vladimir Putin and North Korean leader Kim Jong Un this week.
The agreement pledges mutual defense assistance in the event of war. South Korea says the deal poses a threat to its security and warned that it could consider sending arms to Ukraine to help fight off the Russian invasion as a response — a move that would surely ruin its relations with Moscow.
Hezbollah is also part of the 4+1 treaty involving other Middle East countries and Russia. And Israel is ramping up attacks against them. Russia signing with NK could draw them into that too.