BP is yet again leading the Footsie lower after a double blow to its prospects delivered in the US and Russia.US president Barack Obama has said he'd sack the company's chief executive Tony Hayward in an interview with NBC to be aired tonight. Obama took exception to Hayward's comments that he wanted his "life back" and that the Gulf of Mexico was "a big ocean". This comes on a day when BP reaffirmed that the first quarter dividend of 14 cents a share will be paid on 21 June. BP suffered another blow when Russia's state-run gas giant Gazprom said it had no need for the British oil company's massive Kovykta gas field in Siberia. The Russian export monopoly had planned to buy the field from BP's 50:50 joint venture TNK-BP in 2007 for as much as $900m. It had been hoped that Gazprom had revived its interest and would pay up to $1bn for the asset.Tesco is also lower after it announced the retirement of its 54 year old chief executive Terry Leahy in March 2011. He will be replaced by Philip Clarke, which is less than five years younger. Clarke first worked for Tesco in 1974 when he was still at school. There are a few firms bucking the trend. Temporary power and temperature control services firm Aggreko expects its performance this year will be significantly better than previously anticipated. A general recovery in demand and the World Cup are behind the strong trading. At the interim stage revenue in constant currency and excluding pass-through fuel will grow by around 10%, and trading profit will rise by about 20%.The interim results will be announced on 25 August. G4S is acquiring Instalarme in Brazil for an initial £17.1m. Instalarme is the largest company in the Brazilian electronic security market. G4S hopes to get a boost from the World Cup in 2014 and Olympics in 2016, which will both be held in Brazil.FTSE 100 - RisersAggreko (AGK) 1,403.00p +3.62%Fresnillo (FRES) 921.50p +2.67%G4S (GFS) 270.10p +1.35%ICAP (IAP) 389.10p +1.04%Reed Elsevier (REL) 475.80p +0.93%Randgold Resources (RRS) 6,005.00p +0.84%Unilever (ULVR) 1,863.00p +0.70%BHP Billiton (BLT) 1,746.50p +0.66%Capital Shopping Centres Group (CSCG) 322.10p +0.62%Anglo American (AAL) 2,470.00p +0.49%FTSE 100 - FallersBP (BP.) 405.50p -5.76%Lloyds Banking Group (LLOY) 52.00p -3.63%Wolseley (WOS) 1,532.00p -3.47%British Airways (BAY) 190.50p -3.00%TUI Travel (TT.) 216.50p -2.96%Cable & Wireless Worldwide (CW.) 82.85p -2.82%ARM Holdings (ARM) 265.20p -2.79%Tesco (TSCO) 395.85p -2.76%Royal Bank of Scotland Group (RBS) 41.90p -2.76%Thomas Cook Group (TCG) 191.20p -2.65%