AIIB President Jin Liqun says many countries are waiting in line to join the new international financial institution.
China PMI dropped to 49.2 from 49.4, Indonesia's down to 50.6 from 50.9 while Malaysia's came at a 5-month low of 47.2.
Deputy Finance Minister Visut Srisuphan says 2016 will be a challenging year for real estate sector.
There was a major shuffle in European ranking while Asia generally saw major economies declining except India and Thailand.
Won slipped 0.8% followed by the Taiwan dollar, Indian rupee and the Malaysian ringgit and the Philippine peso which dropped 0.6% to 0.4%.
The Singdollar is expected drop further along with the rest of Asian currencies on Monday as the greenback has rallied to a 70-day high against the euro.
Charts suggest that the pair is now likely to break the January high of 6.60 making a new 5-year low for the yuan.
The government has maintained its 2016 GDP forecast range at 1-3%.
Singapore's GDP forecast to expand 1.0 to 3.0 percent in 2016.
Singapore is the most active country in the region in terms of venture capital and startup enterprises.
The seasonally adjusted unemployment rate came at 3.97% in April, its highest since June 2014 and up from 3.92% in March.
MAS says it expects the core inflation to continue to accelerate and disinflationary effects of recent policy actions to ease going forward.
The April consumer price data is due on 23 May and the final Q1 GDP data will be out on 25th.
The Philippine Peso has, however, been the sole gainer.
Lee makes first trip to Russia in 40 years to attend the ASEAN-Russia Commemorative Summit in Sochi.