As the US relinquishes its global leadership role the other big powers like Russia,China, Germany and Europe will start expanding their sphere of influence to gain political power and dominant status. Confrontations between competing powers will grow for territorial and military power to attain super power status. Particularly Russia that was enjoying a super power status before the break-up of the Soviet Union has already been trying to regain its global leadership role as is obvious with annexation of Crimea and occupying part of Ukraine and further domination in Poland and Hungary . Flexing its muscles further, Kremlin is attempting to split NATO..
Trump administration is already working on a strategy to bring about a change in the Mid-East -Muslim world by favouring Israel in huge settlements in West Bank and Jerusalem but siding with Saudi Arabia for economic interests while Russia continues to play a leading role in Syria and Palestinian government has asked Putin to play a major role in the Middle East peace process.
Russia has extended invitation to US President Trump to visit Moscow for lifting some of the economic sanctions and Trump contemplates to create a wedge between Russia and China which is expanding its trade with numerous countries as Central Asian Republics, Asian nations and even Europe are becoming interdependent on China for trade.
As Trump weakens US foot print in Asia Pacific by abandoning the Trans-Pacific Partnership ,the largest trade accord in history , would have set new terms for trade and business investment among the US and 11 other Pacific rim nations .
But there are chances of Donald Trump reversing his “America First’ foreign Policy as the decisions and executive orders signed by him like TPP etc if they will make America less influential, no economic benefit by giving up the security of US allies and calling back of US troops from the bases provided to American forces by different countries in the world .
As because super power status hinges on the US military presence coupled with the economic ties with the various countries .Since 2005 China has already stepped into US shoes by creating military / naval bases, stationing of its troops and establishing trade relations in different parts of the world.
Then how Trump is going to confront China in South China Sea .China that has been expanding its financial and economic power exponentially is likely to face problems ,its economy being based on state controlled inefficient economy and consequently debt ridden economy.
The major challenge for the main top world leaders will be to ensure that the world may not plunge into chaos and the terrorist groups and jihadist of Islamic State are not able to consolidate their position any further.